From ecc5f5651d12e83c873db73a9c1c062a7bc484b7 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Fri, 27 Jun 2025 04:23:02 -0400
Subject: [PATCH 01/14] Initial draft of techniques changelog generation script
 (with TODOs)

---
 11ty/generate-techniques-changelog-data.ts | 148 ++++++
 techniques/changelog.11tydata.json         | 520 +++++++++++++++++++++
 2 files changed, 668 insertions(+)
 create mode 100644 11ty/generate-techniques-changelog-data.ts
 create mode 100644 techniques/changelog.11tydata.json

diff --git a/11ty/generate-techniques-changelog-data.ts b/11ty/generate-techniques-changelog-data.ts
new file mode 100644
index 0000000000..ce858771ac
--- /dev/null
+++ b/11ty/generate-techniques-changelog-data.ts
@@ -0,0 +1,148 @@
+// TODOs:
+// - Handle running for 2.1 vs. 2.2 (would probably be easier by reusing techniques.ts, either as part of 11ty build or otherwise)
+// - Create techniques/changelog.html template, migrating changelog out of techniques/index.html
+//   - Ideally use {{ linkTechniques | ... }} for additions; removals should get titles but shouldn't link
+//     - Create cousin `labelTechnique` filter that only applies title logic w/o link?
+
+import { technologies, technologyTitles } from "11ty/techniques";
+import { exec } from "child_process";
+import { access, readFile, writeFile } from "fs/promises";
+import { glob } from "glob";
+import { basename, join } from "path";
+import { promisify } from "util";
+
+const execAsync = promisify(exec);
+
+// Only list changes since initial 2.1 rec publication.
+// Note: this script intentionally searches the full commit list,
+// then later filters by date, rather than truncating the list of commits.
+// The latter would cause additional edge cases
+// (e.g. due to a few files being re-added after deletion)
+// and would only save ~10% of total run time.
+const sinceDate = new Date(2018, 5, 6);
+
+interface Entry {
+  date: Date;
+  technique: string;
+  type: "added" | "removed";
+}
+
+interface CompoundEntry extends Omit<Entry, "technique"> {
+  techniques: string[];
+}
+
+const entries: Entry[] = [];
+
+const excludes = {
+  G222: true, // Was added then removed, related to a SC that was never published
+};
+
+/** Checks for existence and non-obsolescene of technique. */
+const checkTechnique = async (path: string) =>
+  access(path).then(
+    () => readFile(path, "utf8").then((content) => !/^obsoleteSince:/m.test(content)),
+    () => false
+  );
+
+async function getEarliestDate(path: string, mode: "add" | "remove" | "obsolete") {
+  const modeArgs: Record<typeof mode, string> = {
+    // --diff-filter=A is NOT used for additions because it misses odd merge commit cases e.g. F99.
+    // (Not using it seems to have negligible performance difference and causes no other changes.)
+    add: "",
+    remove: "--diff-filter=D",
+    obsolete: `-S ${path.endsWith(".json") ? `'"obsoleteSince":'` : "obsoleteSince:"}`,
+  };
+  const command = `git log ${modeArgs[mode]} --format=%ad --date=iso-strict -- ${path} | tail -1`;
+  const output = (await execAsync(command)).stdout.trim();
+  return output ? new Date(output) : null;
+}
+
+function resolveEarliestDate(a: Date | null, b: Date | null) {
+  if (a && b) return new Date(Math.min(+a, +b));
+  if (a || b) return a || b;
+  return null;
+}
+
+const startTime = Date.now();
+for (const technology of technologies) {
+  const techniquesPath = join("techniques", technology);
+  const techniquesFiles = (await glob("*.html", { cwd: techniquesPath })).filter((filename) =>
+    /^[A-Z]+\d+\.html$/.test(filename)
+  );
+  if (!techniquesFiles.length) continue;
+
+  const code = techniquesFiles[0].replace(/\d+\.html$/, "");
+  const technologyObsolescenceDate = await getEarliestDate(
+    join(techniquesPath, `${technology}.11tydata.json`),
+    "obsolete"
+  );
+  if (technologyObsolescenceDate && technologyObsolescenceDate > sinceDate) {
+    // The above check can handle future cases of marking an entire folder as obsolete;
+    // for preceding cases (Flash/SL), check the first technique file for removal
+    const technologyRemovalDate = await getEarliestDate(
+      join(techniquesPath, `${code}1.html`),
+      "remove"
+    );
+    entries.push({
+      date: technologyRemovalDate || technologyObsolescenceDate,
+      technique: `all ${technologyTitles[technology]}`,
+      type: "removed",
+    });
+    continue;
+  }
+
+  const max = techniquesFiles.reduce((currentMax, filename) => {
+    const num = +basename(filename, ".html").replace(/^[A-Z]+/, "");
+    return Math.max(num, currentMax);
+  }, 0);
+
+  for (let i = 1; i <= max; i++) {
+    const techniquePath = join(techniquesPath, `${code}${i}.html`);
+    const technique = basename(techniquePath, ".html");
+    if (technique in excludes) continue;
+
+    const additionDate = await getEarliestDate(techniquePath, "add");
+    if (!additionDate) continue; // Skip if added prior to start date
+    if (additionDate > sinceDate)
+      entries.push({
+        date: additionDate,
+        technique,
+        type: "added",
+      });
+
+    const removalDate = (await checkTechnique(techniquePath))
+      ? null
+      : resolveEarliestDate(
+          await getEarliestDate(techniquePath, "remove"),
+          await getEarliestDate(techniquePath, "obsolete")
+        );
+    if (removalDate && removalDate > sinceDate)
+      entries.push({
+        date: removalDate,
+        technique,
+        type: "removed",
+      });
+  }
+}
+
+// Sort most-recent-first, tie-breaking by additions before removals
+entries.sort((a, b) => {
+  if (a.date > b.date) return -1;
+  if (a.date < b.date) return 1;
+  if (a.type < b.type) return -1;
+  if (a.type > b.type) return 1;
+  return 0;
+});
+
+const compoundEntries = entries.reduce((collectedEntries, { date, technique, type }) => {
+  const previousEntry = collectedEntries[collectedEntries.length - 1];
+  if (previousEntry && previousEntry.type === type && +previousEntry.date === +date)
+    previousEntry.techniques.push(technique);
+  else collectedEntries.push({ date, techniques: [technique], type });
+  return collectedEntries;
+}, [] as CompoundEntry[]);
+
+const filename = join("techniques", "changelog.11tydata.json");
+await writeFile(filename, JSON.stringify(compoundEntries, null, "  "));
+
+console.log(`${filename} written in ${Date.now() - startTime}ms`);
diff --git a/techniques/changelog.11tydata.json b/techniques/changelog.11tydata.json
new file mode 100644
index 0000000000..9171ec2c06
--- /dev/null
+++ b/techniques/changelog.11tydata.json
@@ -0,0 +1,520 @@
+[
+  {
+    "date": "2025-06-20T14:07:03.000Z",
+    "techniques": [
+      "F113"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-06-02T17:10:48.000Z",
+    "techniques": [
+      "G226"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-04-22T14:04:54.000Z",
+    "techniques": [
+      "F112"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-04-22T14:04:54.000Z",
+    "techniques": [
+      "F4",
+      "F47"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2025-03-07T18:04:01.000Z",
+    "techniques": [
+      "G224",
+      "G225"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-08-07T15:53:00.000Z",
+    "techniques": [
+      "F70",
+      "F77",
+      "G134",
+      "G192",
+      "H74",
+      "H93",
+      "H94"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-06-12T13:24:09.000Z",
+    "techniques": [
+      "F87"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-05-14T17:38:58.000Z",
+    "techniques": [
+      "C45"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-04-30T18:40:09.000Z",
+    "techniques": [
+      "G187"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-03-11T16:23:36.000Z",
+    "techniques": [
+      "F111"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-02-27T15:49:37.000Z",
+    "techniques": [
+      "SCR21"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-27T15:49:07.000Z",
+    "techniques": [
+      "H70"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-27T15:36:19.000Z",
+    "techniques": [
+      "H75"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-13T18:08:22.000Z",
+    "techniques": [
+      "H59"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-05T17:14:23.000Z",
+    "techniques": [
+      "H102"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-18T11:39:19.000Z",
+    "techniques": [
+      "H101"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-17T13:58:44.000Z",
+    "techniques": [
+      "F110"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-04T09:39:10.000Z",
+    "techniques": [
+      "F109"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-02-14T19:34:45.000Z",
+    "techniques": [
+      "SCR37"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2023-02-10T17:43:14.000Z",
+    "techniques": [
+      "H100"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2022-10-20T19:12:45.000Z",
+    "techniques": [
+      "C43"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2022-06-09T01:44:59.000Z",
+    "techniques": [
+      "H46"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-06T17:27:17.000Z",
+    "techniques": [
+      "H60"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-03T17:49:48.000Z",
+    "techniques": [
+      "H45"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-01T17:54:32.000Z",
+    "techniques": [
+      "H35"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-31T23:21:08.000Z",
+    "techniques": [
+      "H4"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-27T22:59:18.000Z",
+    "techniques": [
+      "H73"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-20T19:47:40.000Z",
+    "techniques": [
+      "all Silverlight Techniques"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2021-09-27T10:17:15.000Z",
+    "techniques": [
+      "G223"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-08-05T21:38:10.000Z",
+    "techniques": [
+      "all Flash Techniques"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2020-07-21T23:29:23.000Z",
+    "techniques": [
+      "C42"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-21T23:25:48.000Z",
+    "techniques": [
+      "G221"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-19T20:23:21.000Z",
+    "techniques": [
+      "H99"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-19T19:54:15.000Z",
+    "techniques": [
+      "G220"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-06-25T12:07:53.000Z",
+    "techniques": [
+      "F108",
+      "G219"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-03-30T21:39:59.000Z",
+    "techniques": [
+      "G218"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-02-06T18:59:24.000Z",
+    "techniques": [
+      "C41"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-27T14:38:29.000Z",
+    "techniques": [
+      "F107"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-12T14:05:39.000Z",
+    "techniques": [
+      "F106"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-12T13:55:44.000Z",
+    "techniques": [
+      "F105"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-03T16:11:19.000Z",
+    "techniques": [
+      "F104"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-27T17:04:52.000Z",
+    "techniques": [
+      "F103"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-08T15:34:32.000Z",
+    "techniques": [
+      "F102"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-01T21:45:55.000Z",
+    "techniques": [
+      "G217"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-23T22:22:38.000Z",
+    "techniques": [
+      "F101"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T22:22:13.000Z",
+    "techniques": [
+      "G215",
+      "G216"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T21:02:50.000Z",
+    "techniques": [
+      "F100"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T20:36:09.000Z",
+    "techniques": [
+      "G214"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-10T16:36:00.000Z",
+    "techniques": [
+      "F99"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-10T16:23:42.000Z",
+    "techniques": [
+      "SCR39"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-18T22:05:46.000Z",
+    "techniques": [
+      "G213"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-18T09:35:43.000Z",
+    "techniques": [
+      "G212"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-11T21:40:12.000Z",
+    "techniques": [
+      "F98"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-05-22T22:22:09.000Z",
+    "techniques": [
+      "ARIA24"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-05-01T18:10:55.000Z",
+    "techniques": [
+      "G211"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-04-26T19:45:05.000Z",
+    "techniques": [
+      "F97"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-04-26T13:54:19.000Z",
+    "techniques": [
+      "G210"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-02-27T00:14:54.000Z",
+    "techniques": [
+      "G209"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-29T23:55:16.000Z",
+    "techniques": [
+      "G208"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-11T01:38:47.000Z",
+    "techniques": [
+      "C40"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-10T16:34:28.000Z",
+    "techniques": [
+      "C39"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-12-14T13:11:14.000Z",
+    "techniques": [
+      "G207"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T23:50:53.000Z",
+    "techniques": [
+      "F96"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T23:27:21.000Z",
+    "techniques": [
+      "F95"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T22:20:01.000Z",
+    "techniques": [
+      "C38"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-16T21:19:52.000Z",
+    "techniques": [
+      "C33",
+      "C34",
+      "C35",
+      "C36",
+      "C37"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-10-04T17:45:00.000Z",
+    "techniques": [
+      "ARIA23"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:44:27.000Z",
+    "techniques": [
+      "H98"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:37:35.000Z",
+    "techniques": [
+      "C32"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:36:59.000Z",
+    "techniques": [
+      "C31"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:35:54.000Z",
+    "techniques": [
+      "F94"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-08-14T22:38:17.000Z",
+    "techniques": [
+      "ARIA22"
+    ],
+    "type": "added"
+  }
+]
\ No newline at end of file

From 8dc60eebb08de99a2410b4880143b221a3126a48 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Thu, 31 Jul 2025 15:35:21 -0400
Subject: [PATCH 02/14] Add preliminary 2.1 support (for obsolete, not
 future-exclusive)

---
 11ty/generate-techniques-changelog-data.ts | 199 ++++----
 techniques/changelog.21.11tydata.json      | 507 ++++++++++++++++++++
 techniques/changelog.22.11tydata.json      | 520 +++++++++++++++++++++
 3 files changed, 1139 insertions(+), 87 deletions(-)
 create mode 100644 techniques/changelog.21.11tydata.json
 create mode 100644 techniques/changelog.22.11tydata.json

diff --git a/11ty/generate-techniques-changelog-data.ts b/11ty/generate-techniques-changelog-data.ts
index ce858771ac..ef402050e1 100644
--- a/11ty/generate-techniques-changelog-data.ts
+++ b/11ty/generate-techniques-changelog-data.ts
@@ -3,14 +3,18 @@
 // - Create techniques/changelog.html template, migrating changelog out of techniques/index.html
 //   - Ideally use {{ linkTechniques | ... }} for additions; removals should get titles but shouldn't link
 //     - Create cousin `labelTechnique` filter that only applies title logic w/o link?
+// - Figure out workflow story (i.e. when do we run this? Could do it ahead of w3c build...)
 
-import { technologies, technologyTitles } from "11ty/techniques";
 import { exec } from "child_process";
 import { access, readFile, writeFile } from "fs/promises";
 import { glob } from "glob";
 import { basename, join } from "path";
 import { promisify } from "util";
 
+import { resolveDecimalVersion } from "./common";
+import type { WcagVersion } from "./guidelines";
+import { technologies, technologyTitles } from "./techniques";
+
 const execAsync = promisify(exec);
 
 // Only list changes since initial 2.1 rec publication.
@@ -31,8 +35,6 @@ interface CompoundEntry extends Omit<Entry, "technique"> {
   techniques: string[];
 }
 
-const entries: Entry[] = [];
-
 const excludes = {
   G222: true, // Was added then removed, related to a SC that was never published
 };
@@ -44,105 +46,128 @@ const checkTechnique = async (path: string) =>
     () => false
   );
 
-async function getEarliestDate(path: string, mode: "add" | "remove" | "obsolete") {
-  const modeArgs: Record<typeof mode, string> = {
-    // --diff-filter=A is NOT used for additions because it misses odd merge commit cases e.g. F99.
-    // (Not using it seems to have negligible performance difference and causes no other changes.)
-    add: "",
-    remove: "--diff-filter=D",
-    obsolete: `-S ${path.endsWith(".json") ? `'"obsoleteSince":'` : "obsoleteSince:"}`,
-  };
-  const command = `git log ${modeArgs[mode]} --format=%ad --date=iso-strict -- ${path} | tail -1`;
-  const output = (await execAsync(command)).stdout.trim();
-  return output ? new Date(output) : null;
-}
-
 function resolveEarliestDate(a: Date | null, b: Date | null) {
   if (a && b) return new Date(Math.min(+a, +b));
   if (a || b) return a || b;
   return null;
 }
 
-const startTime = Date.now();
-for (const technology of technologies) {
-  const techniquesPath = join("techniques", technology);
-  const techniquesFiles = (await glob("*.html", { cwd: techniquesPath })).filter((filename) =>
-    /^[A-Z]+\d+\.html$/.test(filename)
-  );
-  if (!techniquesFiles.length) continue;
+// Cache getEarliestDate results to save time processing across versions
+const earliestDateCache: Record<string, Date | null> = {};
 
-  const code = techniquesFiles[0].replace(/\d+\.html$/, "");
-  const technologyObsolescenceDate = await getEarliestDate(
-    join(techniquesPath, `${technology}.11tydata.json`),
-    "obsolete"
-  );
-  if (technologyObsolescenceDate && technologyObsolescenceDate > sinceDate) {
-    // The above check can handle future cases of marking an entire folder as obsolete;
-    // for preceding cases (Flash/SL), check the first technique file for removal
-    const technologyRemovalDate = await getEarliestDate(
-      join(techniquesPath, `${code}1.html`),
-      "remove"
-    );
-    entries.push({
-      date: technologyRemovalDate || technologyObsolescenceDate,
-      technique: `all ${technologyTitles[technology]}`,
-      type: "removed",
-    });
-    continue;
+// Common function called by getEarlest...Date functions below
+async function getEarliestDate(path: string, logArgs: string) {
+  const cacheKey = `${path} ${logArgs}`;
+  if (!(cacheKey in earliestDateCache)) {
+    const command = `git log ${logArgs} --format=%ad --date=iso-strict -- ${path} | tail -1`;
+    const output = (await execAsync(command)).stdout.trim();
+    earliestDateCache[cacheKey] = output ? new Date(output) : null;
   }
+  return earliestDateCache[cacheKey];
+}
 
-  const max = techniquesFiles.reduce((currentMax, filename) => {
-    const num = +basename(filename, ".html").replace(/^[A-Z]+/, "");
-    return Math.max(num, currentMax);
-  }, 0);
+// --diff-filter=A is NOT used for additions because it misses odd merge commit cases e.g. F99.
+// (Not using it seems to have negligible performance difference and causes no other changes.)
+const getEarliestAdditionDate = (path: string) => getEarliestDate(path, "");
+const getEarliestRemovalDate = (path: string) => getEarliestDate(path, "--diff-filter=D");
+const getEarliestObsolescenceDate = (path: string, version: WcagVersion) => {
+  const valuePattern = `2[0-${version[1]}]`;
+  return getEarliestDate(
+    path,
+    `-G'${
+      path.endsWith(".json")
+        ? `"obsoleteSince": "${valuePattern}"`
+        : `obsoleteSince: ${valuePattern}`
+    }'`
+  );
+};
 
-  for (let i = 1; i <= max; i++) {
-    const techniquePath = join(techniquesPath, `${code}${i}.html`);
-    const technique = basename(techniquePath, ".html");
-    if (technique in excludes) continue;
+async function generateChangelog(version: WcagVersion) {
+  const entries: Entry[] = [];
 
-    const additionDate = await getEarliestDate(techniquePath, "add");
-    if (!additionDate) continue; // Skip if added prior to start date
-    if (additionDate > sinceDate)
-      entries.push({
-        date: additionDate,
-        technique,
-        type: "added",
-      });
+  for (const technology of technologies) {
+    const techniquesPath = join("techniques", technology);
+    const techniquesFiles = (await glob("*.html", { cwd: techniquesPath })).filter((filename) =>
+      /^[A-Z]+\d+\.html$/.test(filename)
+    );
+    if (!techniquesFiles.length) continue;
 
-    const removalDate = (await checkTechnique(techniquePath))
-      ? null
-      : resolveEarliestDate(
-          await getEarliestDate(techniquePath, "remove"),
-          await getEarliestDate(techniquePath, "obsolete")
-        );
-    if (removalDate && removalDate > sinceDate)
+    const code = techniquesFiles[0].replace(/\d+\.html$/, "");
+    const technologyObsolescenceDate = await getEarliestObsolescenceDate(
+      join(techniquesPath, `${technology}.11tydata.json`),
+      version
+    );
+    if (technologyObsolescenceDate && technologyObsolescenceDate > sinceDate) {
+      // The above check can handle future cases of marking an entire folder as obsolete;
+      // for legacy cases (Flash/SL), check the first technique file for removal
+      const technologyRemovalDate = await getEarliestRemovalDate(
+        join(techniquesPath, `${code}1.html`)
+      );
       entries.push({
-        date: removalDate,
-        technique,
+        date: technologyRemovalDate || technologyObsolescenceDate,
+        technique: `all ${technologyTitles[technology]}`,
         type: "removed",
       });
+      continue;
+    }
+
+    const max = techniquesFiles.reduce((currentMax, filename) => {
+      const num = +basename(filename, ".html").replace(/^[A-Z]+/, "");
+      return Math.max(num, currentMax);
+    }, 0);
+
+    for (let i = 1; i <= max; i++) {
+      const techniquePath = join(techniquesPath, `${code}${i}.html`);
+      const technique = basename(techniquePath, ".html");
+      if (technique in excludes) continue;
+
+      const additionDate = await getEarliestAdditionDate(techniquePath);
+      if (!additionDate) continue; // Skip if added prior to start date
+      if (additionDate > sinceDate)
+        entries.push({
+          date: additionDate,
+          technique,
+          type: "added",
+        });
+
+      const removalDate = (await checkTechnique(techniquePath))
+        ? null
+        : resolveEarliestDate(
+            await getEarliestRemovalDate(techniquePath),
+            await getEarliestObsolescenceDate(techniquePath, version)
+          );
+      if (removalDate && removalDate > sinceDate)
+        entries.push({
+          date: removalDate,
+          technique,
+          type: "removed",
+        });
+    }
   }
+
+  // Sort most-recent-first, tie-breaking by additions before removals
+  entries.sort((a, b) => {
+    if (a.date > b.date) return -1;
+    if (a.date < b.date) return 1;
+    if (a.type < b.type) return -1;
+    if (a.type > b.type) return 1;
+    return 0;
+  });
+
+  return entries.reduce((collectedEntries, { date, technique, type }) => {
+    const previousEntry = collectedEntries[collectedEntries.length - 1];
+    if (previousEntry && previousEntry.type === type && +previousEntry.date === +date)
+      previousEntry.techniques.push(technique);
+    else collectedEntries.push({ date, techniques: [technique], type });
+    return collectedEntries;
+  }, [] as CompoundEntry[]);
 }
 
-// Sort most-recent-first, tie-breaking by additions before removals
-entries.sort((a, b) => {
-  if (a.date > b.date) return -1;
-  if (a.date < b.date) return 1;
-  if (a.type < b.type) return -1;
-  if (a.type > b.type) return 1;
-  return 0;
-});
-
-const compoundEntries = entries.reduce((collectedEntries, { date, technique, type }) => {
-  const previousEntry = collectedEntries[collectedEntries.length - 1];
-  if (previousEntry && previousEntry.type === type && +previousEntry.date === +date)
-    previousEntry.techniques.push(technique);
-  else collectedEntries.push({ date, techniques: [technique], type });
-  return collectedEntries;
-}, [] as CompoundEntry[]);
-
-const filename = join("techniques", "changelog.11tydata.json");
-await writeFile(filename, JSON.stringify(compoundEntries, null, "  "));
-
-console.log(`${filename} written in ${Date.now() - startTime}ms`);
+for (const version of ["22", "21"] as const) {
+  const startTime = Date.now();
+  await writeFile(
+    join("techniques", `changelog.${version}.11tydata.json`),
+    JSON.stringify(await generateChangelog(version), null, "  ")
+  );
+  console.log(`Wrote ${resolveDecimalVersion(version)} changelog in ${Date.now() - startTime}ms`);
+}
diff --git a/techniques/changelog.21.11tydata.json b/techniques/changelog.21.11tydata.json
new file mode 100644
index 0000000000..77f7bf3d93
--- /dev/null
+++ b/techniques/changelog.21.11tydata.json
@@ -0,0 +1,507 @@
+[
+  {
+    "date": "2025-06-20T14:07:03.000Z",
+    "techniques": [
+      "F113"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-06-02T17:10:48.000Z",
+    "techniques": [
+      "G226"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-04-22T14:04:54.000Z",
+    "techniques": [
+      "F112"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-04-22T14:04:54.000Z",
+    "techniques": [
+      "F4",
+      "F47"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2025-03-07T18:04:01.000Z",
+    "techniques": [
+      "G224",
+      "G225"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-06-12T13:24:09.000Z",
+    "techniques": [
+      "F87"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-05-14T17:38:58.000Z",
+    "techniques": [
+      "C45"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-04-30T18:40:09.000Z",
+    "techniques": [
+      "G187"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-03-11T16:23:36.000Z",
+    "techniques": [
+      "F111"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-02-27T15:49:37.000Z",
+    "techniques": [
+      "SCR21"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-27T15:49:07.000Z",
+    "techniques": [
+      "H70"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-27T15:36:19.000Z",
+    "techniques": [
+      "H75"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-13T18:08:22.000Z",
+    "techniques": [
+      "H59"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-05T17:14:23.000Z",
+    "techniques": [
+      "H102"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-18T11:39:19.000Z",
+    "techniques": [
+      "H101"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-17T13:58:44.000Z",
+    "techniques": [
+      "F110"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-04T09:39:10.000Z",
+    "techniques": [
+      "F109"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-02-14T19:34:45.000Z",
+    "techniques": [
+      "SCR37"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2023-02-10T17:43:14.000Z",
+    "techniques": [
+      "H100"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2022-10-20T19:12:45.000Z",
+    "techniques": [
+      "C43"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2022-06-09T01:44:59.000Z",
+    "techniques": [
+      "H46"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-06T17:27:17.000Z",
+    "techniques": [
+      "H60"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-03T17:49:48.000Z",
+    "techniques": [
+      "H45"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-01T17:54:32.000Z",
+    "techniques": [
+      "H35"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-31T23:21:08.000Z",
+    "techniques": [
+      "H4"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-27T22:59:18.000Z",
+    "techniques": [
+      "H73"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-20T19:47:40.000Z",
+    "techniques": [
+      "all Silverlight Techniques"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2021-09-27T10:17:15.000Z",
+    "techniques": [
+      "G223"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-08-05T21:38:10.000Z",
+    "techniques": [
+      "all Flash Techniques"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2020-07-21T23:29:23.000Z",
+    "techniques": [
+      "C42"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-21T23:25:48.000Z",
+    "techniques": [
+      "G221"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-19T20:23:21.000Z",
+    "techniques": [
+      "H99"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-19T19:54:15.000Z",
+    "techniques": [
+      "G220"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-06-25T12:07:53.000Z",
+    "techniques": [
+      "F108",
+      "G219"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-03-30T21:39:59.000Z",
+    "techniques": [
+      "G218"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-02-06T18:59:24.000Z",
+    "techniques": [
+      "C41"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-27T14:38:29.000Z",
+    "techniques": [
+      "F107"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-12T14:05:39.000Z",
+    "techniques": [
+      "F106"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-12T13:55:44.000Z",
+    "techniques": [
+      "F105"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-03T16:11:19.000Z",
+    "techniques": [
+      "F104"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-27T17:04:52.000Z",
+    "techniques": [
+      "F103"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-08T15:34:32.000Z",
+    "techniques": [
+      "F102"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-01T21:45:55.000Z",
+    "techniques": [
+      "G217"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-23T22:22:38.000Z",
+    "techniques": [
+      "F101"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T22:22:13.000Z",
+    "techniques": [
+      "G215",
+      "G216"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T21:02:50.000Z",
+    "techniques": [
+      "F100"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T20:36:09.000Z",
+    "techniques": [
+      "G214"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-10T16:36:00.000Z",
+    "techniques": [
+      "F99"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-10T16:23:42.000Z",
+    "techniques": [
+      "SCR39"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-18T22:05:46.000Z",
+    "techniques": [
+      "G213"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-18T09:35:43.000Z",
+    "techniques": [
+      "G212"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-11T21:40:12.000Z",
+    "techniques": [
+      "F98"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-05-22T22:22:09.000Z",
+    "techniques": [
+      "ARIA24"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-05-01T18:10:55.000Z",
+    "techniques": [
+      "G211"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-04-26T19:45:05.000Z",
+    "techniques": [
+      "F97"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-04-26T13:54:19.000Z",
+    "techniques": [
+      "G210"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-02-27T00:14:54.000Z",
+    "techniques": [
+      "G209"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-29T23:55:16.000Z",
+    "techniques": [
+      "G208"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-11T01:38:47.000Z",
+    "techniques": [
+      "C40"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-10T16:34:28.000Z",
+    "techniques": [
+      "C39"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-12-14T13:11:14.000Z",
+    "techniques": [
+      "G207"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T23:50:53.000Z",
+    "techniques": [
+      "F96"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T23:27:21.000Z",
+    "techniques": [
+      "F95"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T22:20:01.000Z",
+    "techniques": [
+      "C38"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-16T21:19:52.000Z",
+    "techniques": [
+      "C33",
+      "C34",
+      "C35",
+      "C36",
+      "C37"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-10-04T17:45:00.000Z",
+    "techniques": [
+      "ARIA23"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:44:27.000Z",
+    "techniques": [
+      "H98"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:37:35.000Z",
+    "techniques": [
+      "C32"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:36:59.000Z",
+    "techniques": [
+      "C31"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:35:54.000Z",
+    "techniques": [
+      "F94"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-08-14T22:38:17.000Z",
+    "techniques": [
+      "ARIA22"
+    ],
+    "type": "added"
+  }
+]
\ No newline at end of file
diff --git a/techniques/changelog.22.11tydata.json b/techniques/changelog.22.11tydata.json
new file mode 100644
index 0000000000..9171ec2c06
--- /dev/null
+++ b/techniques/changelog.22.11tydata.json
@@ -0,0 +1,520 @@
+[
+  {
+    "date": "2025-06-20T14:07:03.000Z",
+    "techniques": [
+      "F113"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-06-02T17:10:48.000Z",
+    "techniques": [
+      "G226"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-04-22T14:04:54.000Z",
+    "techniques": [
+      "F112"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2025-04-22T14:04:54.000Z",
+    "techniques": [
+      "F4",
+      "F47"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2025-03-07T18:04:01.000Z",
+    "techniques": [
+      "G224",
+      "G225"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-08-07T15:53:00.000Z",
+    "techniques": [
+      "F70",
+      "F77",
+      "G134",
+      "G192",
+      "H74",
+      "H93",
+      "H94"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-06-12T13:24:09.000Z",
+    "techniques": [
+      "F87"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-05-14T17:38:58.000Z",
+    "techniques": [
+      "C45"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-04-30T18:40:09.000Z",
+    "techniques": [
+      "G187"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-03-11T16:23:36.000Z",
+    "techniques": [
+      "F111"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2024-02-27T15:49:37.000Z",
+    "techniques": [
+      "SCR21"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-27T15:49:07.000Z",
+    "techniques": [
+      "H70"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-27T15:36:19.000Z",
+    "techniques": [
+      "H75"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-13T18:08:22.000Z",
+    "techniques": [
+      "H59"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2024-02-05T17:14:23.000Z",
+    "techniques": [
+      "H102"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-18T11:39:19.000Z",
+    "techniques": [
+      "H101"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-17T13:58:44.000Z",
+    "techniques": [
+      "F110"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-05-04T09:39:10.000Z",
+    "techniques": [
+      "F109"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2023-02-14T19:34:45.000Z",
+    "techniques": [
+      "SCR37"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2023-02-10T17:43:14.000Z",
+    "techniques": [
+      "H100"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2022-10-20T19:12:45.000Z",
+    "techniques": [
+      "C43"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2022-06-09T01:44:59.000Z",
+    "techniques": [
+      "H46"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-06T17:27:17.000Z",
+    "techniques": [
+      "H60"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-03T17:49:48.000Z",
+    "techniques": [
+      "H45"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-06-01T17:54:32.000Z",
+    "techniques": [
+      "H35"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-31T23:21:08.000Z",
+    "techniques": [
+      "H4"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-27T22:59:18.000Z",
+    "techniques": [
+      "H73"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2022-05-20T19:47:40.000Z",
+    "techniques": [
+      "all Silverlight Techniques"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2021-09-27T10:17:15.000Z",
+    "techniques": [
+      "G223"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-08-05T21:38:10.000Z",
+    "techniques": [
+      "all Flash Techniques"
+    ],
+    "type": "removed"
+  },
+  {
+    "date": "2020-07-21T23:29:23.000Z",
+    "techniques": [
+      "C42"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-21T23:25:48.000Z",
+    "techniques": [
+      "G221"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-19T20:23:21.000Z",
+    "techniques": [
+      "H99"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-07-19T19:54:15.000Z",
+    "techniques": [
+      "G220"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-06-25T12:07:53.000Z",
+    "techniques": [
+      "F108",
+      "G219"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-03-30T21:39:59.000Z",
+    "techniques": [
+      "G218"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2020-02-06T18:59:24.000Z",
+    "techniques": [
+      "C41"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-27T14:38:29.000Z",
+    "techniques": [
+      "F107"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-12T14:05:39.000Z",
+    "techniques": [
+      "F106"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-12T13:55:44.000Z",
+    "techniques": [
+      "F105"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-09-03T16:11:19.000Z",
+    "techniques": [
+      "F104"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-27T17:04:52.000Z",
+    "techniques": [
+      "F103"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-08T15:34:32.000Z",
+    "techniques": [
+      "F102"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-08-01T21:45:55.000Z",
+    "techniques": [
+      "G217"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-23T22:22:38.000Z",
+    "techniques": [
+      "F101"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T22:22:13.000Z",
+    "techniques": [
+      "G215",
+      "G216"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T21:02:50.000Z",
+    "techniques": [
+      "F100"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-16T20:36:09.000Z",
+    "techniques": [
+      "G214"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-10T16:36:00.000Z",
+    "techniques": [
+      "F99"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-07-10T16:23:42.000Z",
+    "techniques": [
+      "SCR39"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-18T22:05:46.000Z",
+    "techniques": [
+      "G213"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-18T09:35:43.000Z",
+    "techniques": [
+      "G212"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-06-11T21:40:12.000Z",
+    "techniques": [
+      "F98"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-05-22T22:22:09.000Z",
+    "techniques": [
+      "ARIA24"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-05-01T18:10:55.000Z",
+    "techniques": [
+      "G211"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-04-26T19:45:05.000Z",
+    "techniques": [
+      "F97"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-04-26T13:54:19.000Z",
+    "techniques": [
+      "G210"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-02-27T00:14:54.000Z",
+    "techniques": [
+      "G209"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-29T23:55:16.000Z",
+    "techniques": [
+      "G208"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-11T01:38:47.000Z",
+    "techniques": [
+      "C40"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2019-01-10T16:34:28.000Z",
+    "techniques": [
+      "C39"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-12-14T13:11:14.000Z",
+    "techniques": [
+      "G207"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T23:50:53.000Z",
+    "techniques": [
+      "F96"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T23:27:21.000Z",
+    "techniques": [
+      "F95"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-29T22:20:01.000Z",
+    "techniques": [
+      "C38"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-11-16T21:19:52.000Z",
+    "techniques": [
+      "C33",
+      "C34",
+      "C35",
+      "C36",
+      "C37"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-10-04T17:45:00.000Z",
+    "techniques": [
+      "ARIA23"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:44:27.000Z",
+    "techniques": [
+      "H98"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:37:35.000Z",
+    "techniques": [
+      "C32"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:36:59.000Z",
+    "techniques": [
+      "C31"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-09-05T08:35:54.000Z",
+    "techniques": [
+      "F94"
+    ],
+    "type": "added"
+  },
+  {
+    "date": "2018-08-14T22:38:17.000Z",
+    "techniques": [
+      "ARIA22"
+    ],
+    "type": "added"
+  }
+]
\ No newline at end of file

From 8cd11ca2ebafdd97c5ca9b35c39f79925e346494 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Fri, 1 Aug 2025 06:33:52 -0400
Subject: [PATCH 03/14] Move some logic out of eleventy.config.ts for reuse by
 changelog script

---
 11ty/data-dependencies.ts | 107 ++++++++++++++++++++++++++++++++++++++
 11ty/techniques.ts        |   7 +++
 11ty/understanding.ts     |   2 +-
 eleventy.config.ts        | 106 ++++++++-----------------------------
 4 files changed, 136 insertions(+), 86 deletions(-)
 create mode 100644 11ty/data-dependencies.ts

diff --git a/11ty/data-dependencies.ts b/11ty/data-dependencies.ts
new file mode 100644
index 0000000000..a3aca5847a
--- /dev/null
+++ b/11ty/data-dependencies.ts
@@ -0,0 +1,107 @@
+import {
+  assertIsWcagVersion,
+  getFlatGuidelines,
+  getPrinciples,
+  getPrinciplesForVersion,
+  type FlatGuidelinesMap,
+} from "./guidelines";
+import {
+  getTechniquesByTechnology,
+  getFlatTechniques,
+  getTechniqueAssociations,
+  isTechniqueObsolete,
+  type Technology,
+} from "./techniques";
+import { getUnderstandingDocs, generateUnderstandingNavMap } from "./understanding";
+
+/**
+ * Central function that loads data necessary for the Eleventy build process,
+ * exposed for reuse in separate scripts (e.g. techniques changelog generation).
+ * @param version A version string, e.g. from process.env.WCAG_VERSION; may be undefined
+ */
+export async function loadDataDependencies(version?: string) {
+  const definedVersion = version ?? "22";
+  assertIsWcagVersion(definedVersion);
+
+  /** Tree of Principles/Guidelines/SC across all versions (including later than selected) */
+  const allPrinciples = await getPrinciples();
+  const allFlatGuidelines = getFlatGuidelines(allPrinciples);
+
+  async function resolveRelevantPrinciples() {
+    // Resolve from local filesystem if input version was unset (e.g. no explicit WCAG_VERSION)
+    if (!version) return allPrinciples;
+    // Also resolve from local filesystem if explicit path was given via environment variable
+    if (process.env.WCAG_FORCE_LOCAL_GUIDELINES)
+      return await getPrinciples(process.env.WCAG_FORCE_LOCAL_GUIDELINES);
+    // Otherwise, resolve from published guidelines (requires internet connection)
+    assertIsWcagVersion(definedVersion);
+    return await getPrinciplesForVersion(definedVersion);
+  }
+
+  const principles = await resolveRelevantPrinciples();
+  const flatGuidelines = getFlatGuidelines(principles);
+  /** Flattened Principles/Guidelines/SC that only exist in later versions (to filter techniques) */
+  const futureGuidelines: FlatGuidelinesMap = {};
+  for (const [key, value] of Object.entries(allFlatGuidelines)) {
+    if (value.version > definedVersion) futureGuidelines[key] = value;
+  }
+
+  const techniques = await getTechniquesByTechnology(flatGuidelines);
+  const flatTechniques = getFlatTechniques(techniques);
+
+  const techniqueAssociations = await getTechniqueAssociations(flatGuidelines);
+  const futureTechniqueAssociations = await getTechniqueAssociations(futureGuidelines);
+  const futureExclusiveTechniqueAssociations: typeof techniqueAssociations = {};
+  for (const [id, associations] of Object.entries(futureTechniqueAssociations)) {
+    if (!techniqueAssociations[id]) futureExclusiveTechniqueAssociations[id] = associations;
+  }
+
+  for (const [id, associations] of Object.entries(techniqueAssociations)) {
+    // Prune associations from non-obsolete techniques to obsolete SCs
+    techniqueAssociations[id] = associations.filter(
+      ({ criterion }) => criterion.level !== "" || isTechniqueObsolete(flatTechniques[id], definedVersion)
+    );
+  }
+
+  for (const [technology, list] of Object.entries(techniques)) {
+    // Prune techniques that are obsolete or associated with SCs from later versions
+    // (only prune hierarchical structure for ToC; keep all in flatTechniques for lookups)
+    techniques[technology as Technology] = list.filter(
+      (technique) =>
+        (!technique.obsoleteSince || technique.obsoleteSince > definedVersion) &&
+        !futureExclusiveTechniqueAssociations[technique.id]
+    );
+  }
+
+  const understandingDocs = getUnderstandingDocs(definedVersion);
+  const understandingNav = generateUnderstandingNavMap(principles, understandingDocs);
+
+  return {
+    /** Tree of Principles/Guidelines/SC relevant to selected version */
+    principles,
+    /** Flattened Principles/Guidelines/SC relevant to selected version */
+    flatGuidelines,
+    /** Flattened Principles/Guidelines/SC across all versions (including later than selected) */
+    allFlatGuidelines,
+    /**
+     * Techniques organized hierarchically per technology;
+     * excludes obsolete techniques and techniques that only reference SCs of future WCAG versions
+     **/
+    techniques,
+    /**
+     * Techniques organized in a flat map indexed by ID;
+     * _does not_ exclude obsolete/future techniques (so that cross-page links can be resolved)
+     */
+    flatTechniques,
+    /** Maps technique IDs to SCs found in target version */
+    techniqueAssociations,
+    /** Only maps techniques that only reference SCs introduced in future WCAG versions */
+    futureExclusiveTechniqueAssociations,
+    /** Information for other top-level understanding pages */
+    understandingDocs,
+    /** Contains next/previous/parent information for each understanding page, for rendering nav */
+    understandingNav,
+    // Pass back version so the consumer doesn't need to re-assert
+    version: definedVersion,
+  };
+}
diff --git a/11ty/techniques.ts b/11ty/techniques.ts
index 231873696c..d66ad4e845 100644
--- a/11ty/techniques.ts
+++ b/11ty/techniques.ts
@@ -41,6 +41,13 @@ function assertIsTechnology(
   if (!(technology in technologyTitles)) throw new Error(`Invalid technology name: ${technology}`);
 }
 
+/**
+ * Returns boolean indicating whether a technique is obsolete for the given version.
+ * Tolerates undefined for use with hash lookups.
+ */
+export const isTechniqueObsolete = (technique: Technique | undefined, version: WcagVersion) =>
+  !!technique?.obsoleteSince && technique.obsoleteSince <= version;
+
 export const techniqueAssociationTypes = ["sufficient", "advisory", "failure"] as const;
 export type TechniqueAssociationType = (typeof techniqueAssociationTypes)[number];
 
diff --git a/11ty/understanding.ts b/11ty/understanding.ts
index 1379b1915c..b5114a4a48 100644
--- a/11ty/understanding.ts
+++ b/11ty/understanding.ts
@@ -15,7 +15,7 @@ export const techniqueToUnderstandingLinkSelector = [
  * Resolves information for top-level understanding pages;
  * ported from generate-structure-xml.xslt
  */
-export async function getUnderstandingDocs(version: WcagVersion): Promise<DocNode[]> {
+export function getUnderstandingDocs(version: WcagVersion): DocNode[] {
   const decimalVersion = resolveDecimalVersion(version);
   return [
     {
diff --git a/eleventy.config.ts b/eleventy.config.ts
index 7a605c8ad8..6304315ae1 100644
--- a/eleventy.config.ts
+++ b/eleventy.config.ts
@@ -8,41 +8,42 @@ import { join } from "path";
 
 import { CustomLiquid } from "11ty/CustomLiquid";
 import { resolveDecimalVersion } from "11ty/common";
+import { loadDataDependencies } from "11ty/data-dependencies";
 import {
   actRules,
-  assertIsWcagVersion,
   getErrataForVersion,
-  getFlatGuidelines,
-  getPrinciples,
-  getPrinciplesForVersion,
   getTermsMap,
   getTermsMapForVersion,
   scSlugOverrides,
-  type FlatGuidelinesMap,
   type WcagItem,
 } from "11ty/guidelines";
 import {
-  getFlatTechniques,
-  getTechniqueAssociations,
-  getTechniquesByTechnology,
+  isTechniqueObsolete as isTechniqueObsoleteForVersion,
   technologies,
   technologyTitles,
   type Technique,
-  type Technology,
 } from "11ty/techniques";
-import { generateUnderstandingNavMap, getUnderstandingDocs } from "11ty/understanding";
 import type { EleventyContext, EleventyData, EleventyEvent } from "11ty/types";
 
-/** Version of WCAG to build */
-const version = process.env.WCAG_VERSION || "22";
-assertIsWcagVersion(version);
+const {
+  principles,
+  flatGuidelines,
+  allFlatGuidelines,
+  techniques,
+  flatTechniques,
+  techniqueAssociations,
+  futureExclusiveTechniqueAssociations,
+  understandingDocs,
+  understandingNav,
+  version,
+} = await loadDataDependencies(process.env.WCAG_VERSION);
+
+const skippedTechniques = Object.keys(futureExclusiveTechniqueAssociations).sort().join(", ");
+if (skippedTechniques)
+  console.log(`Skipping techniques that only reference later-version SCs: ${skippedTechniques}`);
 
-/**
- * Returns boolean indicating whether a technique is obsolete for the given version.
- * Tolerates undefined for use with hash lookups.
- */
 const isTechniqueObsolete = (technique: Technique | undefined) =>
-  !!technique?.obsoleteSince && technique.obsoleteSince <= version;
+  isTechniqueObsoleteForVersion(technique, version);
 
 /**
  * Returns boolean indicating whether an SC is obsolete for the given version.
@@ -51,73 +52,12 @@ const isTechniqueObsolete = (technique: Technique | undefined) =>
 const isGuidelineObsolete = (guideline: WcagItem | undefined) =>
   guideline?.type === "SC" && guideline.level === "";
 
-/** Tree of Principles/Guidelines/SC across all versions (including later than selected) */
-const allPrinciples = await getPrinciples();
-/** Flattened Principles/Guidelines/SC across all versions (including later than selected) */
-const allFlatGuidelines = getFlatGuidelines(allPrinciples);
-
-async function resolveRelevantPrinciples() {
-  if (!process.env.WCAG_VERSION) return allPrinciples;
-  if (process.env.WCAG_FORCE_LOCAL_GUIDELINES)
-    return await getPrinciples(process.env.WCAG_FORCE_LOCAL_GUIDELINES);
-  assertIsWcagVersion(version);
-  return await getPrinciplesForVersion(version);
-}
-
-/** Tree of Principles/Guidelines/SC relevant to selected version */
-const principles = await resolveRelevantPrinciples();
-/** Flattened Principles/Guidelines/SC relevant to selected version */
-const flatGuidelines = getFlatGuidelines(principles);
-/** Flattened Principles/Guidelines/SC that only exist in later versions (to filter techniques) */
-const futureGuidelines: FlatGuidelinesMap = {};
-for (const [key, value] of Object.entries(allFlatGuidelines)) {
-  if (value.version > version) futureGuidelines[key] = value;
-}
-
-const techniques = await getTechniquesByTechnology(flatGuidelines);
-const flatTechniques = getFlatTechniques(techniques);
-
-/** Maps technique IDs to SCs found in target version */
-const techniqueAssociations = await getTechniqueAssociations(flatGuidelines);
-for (const [id, associations] of Object.entries(techniqueAssociations)) {
-  // Prune associations from non-obsolete techniques to obsolete SCs
-  techniqueAssociations[id] = associations.filter(
-    ({ criterion }) => criterion.level !== "" || isTechniqueObsolete(flatTechniques[id])
-  );
-}
-/** Maps technique IDs to SCs only found in later versions */
-const futureTechniqueAssociations = await getTechniqueAssociations(futureGuidelines);
-/** Subset of futureTechniqueAssociations not overlapping with techniqueAssociations */
-const futureExclusiveTechniqueAssociations: typeof techniqueAssociations = {};
-
-for (const [id, associations] of Object.entries(futureTechniqueAssociations)) {
-  if (!techniqueAssociations[id]) futureExclusiveTechniqueAssociations[id] = associations;
-}
-const skippedTechniques = Object.keys(futureExclusiveTechniqueAssociations).sort().join(", ");
-if (skippedTechniques)
-  console.log(`Skipping techniques that only reference later-version SCs: ${skippedTechniques}`);
-
-for (const [technology, list] of Object.entries(techniques)) {
-  // Prune techniques that are obsolete or associated with SCs from later versions
-  // (only prune hierarchical structure for ToC; keep all in flatTechniques for lookups)
-  techniques[technology as Technology] = list.filter(
-    (technique) =>
-      (!technique.obsoleteSince || technique.obsoleteSince > version) &&
-      !futureExclusiveTechniqueAssociations[technique.id]
-  );
-}
-
-const understandingDocs = await getUnderstandingDocs(version);
-const understandingNav = await generateUnderstandingNavMap(principles, understandingDocs);
-
 function resolveRelevantTermsMap() {
   if (!process.env.WCAG_VERSION) return getTermsMap();
   if (process.env.WCAG_FORCE_LOCAL_GUIDELINES)
     return getTermsMap(process.env.WCAG_FORCE_LOCAL_GUIDELINES);
-  assertIsWcagVersion(version);
   return getTermsMapForVersion(version);
 }
-const termsMap = await resolveRelevantTermsMap();
 
 // Declare static global data up-front so we can build typings from it
 const globalData = {
@@ -164,10 +104,7 @@ if (process.env.WCAG_MODE === "editors") {
 
 /** Applies any overridden SC IDs to incoming Understanding fileSlugs */
 function resolveUnderstandingFileSlug(fileSlug: string) {
-  if (fileSlug in scSlugOverrides) {
-    assertIsWcagVersion(version);
-    return scSlugOverrides[fileSlug](version);
-  }
+  if (fileSlug in scSlugOverrides) return scSlugOverrides[fileSlug](version);
   return fileSlug;
 }
 
@@ -287,7 +224,6 @@ export default async function (eleventyConfig: any) {
     // Since json isn't a template format and we're generating it, write it directly
     if (process.env.WCAG_JSON) {
       const { generateWcagJson } = await import("11ty/json");
-      assertIsWcagVersion(version);
       await writeFile(`${dir.output}/wcag.json`, await generateWcagJson(version));
     }
 
@@ -307,7 +243,7 @@ export default async function (eleventyConfig: any) {
       jsTruthy: true,
       strictFilters: true,
       timezoneOffset: 0, // Avoid off-by-one YYYY-MM-DD date stamp conversions
-      termsMap,
+      termsMap: await resolveRelevantTermsMap(),
     })
   );
 

From 51fc67389af21474ff4acd6c0c68b7875b6263af Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Fri, 1 Aug 2025 06:34:50 -0400
Subject: [PATCH 04/14] Exclude future-SC-only techniques from past-version
 changelog

---
 11ty/generate-techniques-changelog-data.ts |  4 +-
 techniques/changelog.21.11tydata.json      | 71 ----------------------
 2 files changed, 3 insertions(+), 72 deletions(-)

diff --git a/11ty/generate-techniques-changelog-data.ts b/11ty/generate-techniques-changelog-data.ts
index ef402050e1..ba5a7258be 100644
--- a/11ty/generate-techniques-changelog-data.ts
+++ b/11ty/generate-techniques-changelog-data.ts
@@ -14,6 +14,7 @@ import { promisify } from "util";
 import { resolveDecimalVersion } from "./common";
 import type { WcagVersion } from "./guidelines";
 import { technologies, technologyTitles } from "./techniques";
+import { loadDataDependencies } from "./data-dependencies";
 
 const execAsync = promisify(exec);
 
@@ -83,6 +84,7 @@ const getEarliestObsolescenceDate = (path: string, version: WcagVersion) => {
 };
 
 async function generateChangelog(version: WcagVersion) {
+  const { futureExclusiveTechniqueAssociations } = await loadDataDependencies(version);
   const entries: Entry[] = [];
 
   for (const technology of technologies) {
@@ -119,7 +121,7 @@ async function generateChangelog(version: WcagVersion) {
     for (let i = 1; i <= max; i++) {
       const techniquePath = join(techniquesPath, `${code}${i}.html`);
       const technique = basename(techniquePath, ".html");
-      if (technique in excludes) continue;
+      if (technique in excludes || technique in futureExclusiveTechniqueAssociations) continue;
 
       const additionDate = await getEarliestAdditionDate(techniquePath);
       if (!additionDate) continue; // Skip if added prior to start date
diff --git a/techniques/changelog.21.11tydata.json b/techniques/changelog.21.11tydata.json
index 77f7bf3d93..6272e47b4c 100644
--- a/techniques/changelog.21.11tydata.json
+++ b/techniques/changelog.21.11tydata.json
@@ -106,20 +106,6 @@
     ],
     "type": "added"
   },
-  {
-    "date": "2023-05-17T13:58:44.000Z",
-    "techniques": [
-      "F110"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2023-05-04T09:39:10.000Z",
-    "techniques": [
-      "F109"
-    ],
-    "type": "added"
-  },
   {
     "date": "2023-02-14T19:34:45.000Z",
     "techniques": [
@@ -127,20 +113,6 @@
     ],
     "type": "removed"
   },
-  {
-    "date": "2023-02-10T17:43:14.000Z",
-    "techniques": [
-      "H100"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2022-10-20T19:12:45.000Z",
-    "techniques": [
-      "C43"
-    ],
-    "type": "added"
-  },
   {
     "date": "2022-06-09T01:44:59.000Z",
     "techniques": [
@@ -204,20 +176,6 @@
     ],
     "type": "removed"
   },
-  {
-    "date": "2020-07-21T23:29:23.000Z",
-    "techniques": [
-      "C42"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-07-21T23:25:48.000Z",
-    "techniques": [
-      "G221"
-    ],
-    "type": "added"
-  },
   {
     "date": "2020-07-19T20:23:21.000Z",
     "techniques": [
@@ -225,35 +183,6 @@
     ],
     "type": "added"
   },
-  {
-    "date": "2020-07-19T19:54:15.000Z",
-    "techniques": [
-      "G220"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-06-25T12:07:53.000Z",
-    "techniques": [
-      "F108",
-      "G219"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-03-30T21:39:59.000Z",
-    "techniques": [
-      "G218"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-02-06T18:59:24.000Z",
-    "techniques": [
-      "C41"
-    ],
-    "type": "added"
-  },
   {
     "date": "2019-09-27T14:38:29.000Z",
     "techniques": [

From 5572a2be5824a1a5b56c6a4df1db5afedd1a1f4a Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Fri, 1 Aug 2025 14:52:31 -0400
Subject: [PATCH 05/14] Write data to a single file so it will work as
 template-specific data

---
 11ty/generate-techniques-changelog-data.ts |   24 +-
 techniques/changelog.11tydata.json         | 1479 +++++++++++++-------
 techniques/changelog.21.11tydata.json      |  436 ------
 techniques/changelog.22.11tydata.json      |  520 -------
 4 files changed, 976 insertions(+), 1483 deletions(-)
 delete mode 100644 techniques/changelog.21.11tydata.json
 delete mode 100644 techniques/changelog.22.11tydata.json

diff --git a/11ty/generate-techniques-changelog-data.ts b/11ty/generate-techniques-changelog-data.ts
index ba5a7258be..036d7fbb49 100644
--- a/11ty/generate-techniques-changelog-data.ts
+++ b/11ty/generate-techniques-changelog-data.ts
@@ -165,11 +165,19 @@ async function generateChangelog(version: WcagVersion) {
   }, [] as CompoundEntry[]);
 }
 
-for (const version of ["22", "21"] as const) {
-  const startTime = Date.now();
-  await writeFile(
-    join("techniques", `changelog.${version}.11tydata.json`),
-    JSON.stringify(await generateChangelog(version), null, "  ")
-  );
-  console.log(`Wrote ${resolveDecimalVersion(version)} changelog in ${Date.now() - startTime}ms`);
-}
+const startTime = Date.now();
+await writeFile(
+  join("techniques", `changelog.11tydata.json`),
+  JSON.stringify(
+    {
+      "//": "DO NOT EDIT THIS FILE; it is automatically generated",
+      changelog: {
+        "21": await generateChangelog("21"),
+        "22": await generateChangelog("22"),
+      },
+    },
+    null,
+    "  "
+  )
+);
+console.log(`Wrote changelog in ${Date.now() - startTime}ms`);
diff --git a/techniques/changelog.11tydata.json b/techniques/changelog.11tydata.json
index 9171ec2c06..3a3de9eb5b 100644
--- a/techniques/changelog.11tydata.json
+++ b/techniques/changelog.11tydata.json
@@ -1,520 +1,961 @@
-[
-  {
-    "date": "2025-06-20T14:07:03.000Z",
-    "techniques": [
-      "F113"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2025-06-02T17:10:48.000Z",
-    "techniques": [
-      "G226"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2025-04-22T14:04:54.000Z",
-    "techniques": [
-      "F112"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2025-04-22T14:04:54.000Z",
-    "techniques": [
-      "F4",
-      "F47"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2025-03-07T18:04:01.000Z",
-    "techniques": [
-      "G224",
-      "G225"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2024-08-07T15:53:00.000Z",
-    "techniques": [
-      "F70",
-      "F77",
-      "G134",
-      "G192",
-      "H74",
-      "H93",
-      "H94"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-06-12T13:24:09.000Z",
-    "techniques": [
-      "F87"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-05-14T17:38:58.000Z",
-    "techniques": [
-      "C45"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2024-04-30T18:40:09.000Z",
-    "techniques": [
-      "G187"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-03-11T16:23:36.000Z",
-    "techniques": [
-      "F111"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2024-02-27T15:49:37.000Z",
-    "techniques": [
-      "SCR21"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-02-27T15:49:07.000Z",
-    "techniques": [
-      "H70"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-02-27T15:36:19.000Z",
-    "techniques": [
-      "H75"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-02-13T18:08:22.000Z",
-    "techniques": [
-      "H59"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2024-02-05T17:14:23.000Z",
-    "techniques": [
-      "H102"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2023-05-18T11:39:19.000Z",
-    "techniques": [
-      "H101"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2023-05-17T13:58:44.000Z",
-    "techniques": [
-      "F110"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2023-05-04T09:39:10.000Z",
-    "techniques": [
-      "F109"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2023-02-14T19:34:45.000Z",
-    "techniques": [
-      "SCR37"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2023-02-10T17:43:14.000Z",
-    "techniques": [
-      "H100"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2022-10-20T19:12:45.000Z",
-    "techniques": [
-      "C43"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2022-06-09T01:44:59.000Z",
-    "techniques": [
-      "H46"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2022-06-06T17:27:17.000Z",
-    "techniques": [
-      "H60"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2022-06-03T17:49:48.000Z",
-    "techniques": [
-      "H45"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2022-06-01T17:54:32.000Z",
-    "techniques": [
-      "H35"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2022-05-31T23:21:08.000Z",
-    "techniques": [
-      "H4"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2022-05-27T22:59:18.000Z",
-    "techniques": [
-      "H73"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2022-05-20T19:47:40.000Z",
-    "techniques": [
-      "all Silverlight Techniques"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2021-09-27T10:17:15.000Z",
-    "techniques": [
-      "G223"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-08-05T21:38:10.000Z",
-    "techniques": [
-      "all Flash Techniques"
-    ],
-    "type": "removed"
-  },
-  {
-    "date": "2020-07-21T23:29:23.000Z",
-    "techniques": [
-      "C42"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-07-21T23:25:48.000Z",
-    "techniques": [
-      "G221"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-07-19T20:23:21.000Z",
-    "techniques": [
-      "H99"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-07-19T19:54:15.000Z",
-    "techniques": [
-      "G220"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-06-25T12:07:53.000Z",
-    "techniques": [
-      "F108",
-      "G219"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-03-30T21:39:59.000Z",
-    "techniques": [
-      "G218"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2020-02-06T18:59:24.000Z",
-    "techniques": [
-      "C41"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-09-27T14:38:29.000Z",
-    "techniques": [
-      "F107"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-09-12T14:05:39.000Z",
-    "techniques": [
-      "F106"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-09-12T13:55:44.000Z",
-    "techniques": [
-      "F105"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-09-03T16:11:19.000Z",
-    "techniques": [
-      "F104"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-08-27T17:04:52.000Z",
-    "techniques": [
-      "F103"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-08-08T15:34:32.000Z",
-    "techniques": [
-      "F102"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-08-01T21:45:55.000Z",
-    "techniques": [
-      "G217"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-07-23T22:22:38.000Z",
-    "techniques": [
-      "F101"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-07-16T22:22:13.000Z",
-    "techniques": [
-      "G215",
-      "G216"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-07-16T21:02:50.000Z",
-    "techniques": [
-      "F100"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-07-16T20:36:09.000Z",
-    "techniques": [
-      "G214"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-07-10T16:36:00.000Z",
-    "techniques": [
-      "F99"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-07-10T16:23:42.000Z",
-    "techniques": [
-      "SCR39"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-06-18T22:05:46.000Z",
-    "techniques": [
-      "G213"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-06-18T09:35:43.000Z",
-    "techniques": [
-      "G212"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-06-11T21:40:12.000Z",
-    "techniques": [
-      "F98"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-05-22T22:22:09.000Z",
-    "techniques": [
-      "ARIA24"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-05-01T18:10:55.000Z",
-    "techniques": [
-      "G211"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-04-26T19:45:05.000Z",
-    "techniques": [
-      "F97"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-04-26T13:54:19.000Z",
-    "techniques": [
-      "G210"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-02-27T00:14:54.000Z",
-    "techniques": [
-      "G209"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-01-29T23:55:16.000Z",
-    "techniques": [
-      "G208"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-01-11T01:38:47.000Z",
-    "techniques": [
-      "C40"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-01-10T16:34:28.000Z",
-    "techniques": [
-      "C39"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-12-14T13:11:14.000Z",
-    "techniques": [
-      "G207"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-29T23:50:53.000Z",
-    "techniques": [
-      "F96"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-29T23:27:21.000Z",
-    "techniques": [
-      "F95"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-29T22:20:01.000Z",
-    "techniques": [
-      "C38"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-16T21:19:52.000Z",
-    "techniques": [
-      "C33",
-      "C34",
-      "C35",
-      "C36",
-      "C37"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-10-04T17:45:00.000Z",
-    "techniques": [
-      "ARIA23"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:44:27.000Z",
-    "techniques": [
-      "H98"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:37:35.000Z",
-    "techniques": [
-      "C32"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:36:59.000Z",
-    "techniques": [
-      "C31"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:35:54.000Z",
-    "techniques": [
-      "F94"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-08-14T22:38:17.000Z",
-    "techniques": [
-      "ARIA22"
-    ],
-    "type": "added"
+{
+  "//": "DO NOT EDIT THIS FILE; it is automatically generated",
+  "changelog": {
+    "21": [
+      {
+        "date": "2025-06-20T14:07:03.000Z",
+        "techniques": [
+          "F113"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2025-06-02T17:10:48.000Z",
+        "techniques": [
+          "G226"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2025-04-22T14:04:54.000Z",
+        "techniques": [
+          "F112"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2025-04-22T14:04:54.000Z",
+        "techniques": [
+          "F4",
+          "F47"
+        ],
+        "type": "removed"
+      },
+      {
+        "date": "2025-03-07T18:04:01.000Z",
+        "techniques": [
+          "G224",
+          "G225"
+        ],
+        "type": "added"
+      },
+      {
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+        "type": "added"
+      },
+      {
+        "date": "2018-10-04T17:45:00.000Z",
+        "techniques": [
+          "ARIA23"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2018-09-05T08:44:27.000Z",
+        "techniques": [
+          "H98"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2018-09-05T08:37:35.000Z",
+        "techniques": [
+          "C32"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2018-09-05T08:36:59.000Z",
+        "techniques": [
+          "C31"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2018-09-05T08:35:54.000Z",
+        "techniques": [
+          "F94"
+        ],
+        "type": "added"
+      },
+      {
+        "date": "2018-08-14T22:38:17.000Z",
+        "techniques": [
+          "ARIA22"
+        ],
+        "type": "added"
+      }
+    ]
   }
-]
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/techniques/changelog.21.11tydata.json b/techniques/changelog.21.11tydata.json
deleted file mode 100644
index 6272e47b4c..0000000000
--- a/techniques/changelog.21.11tydata.json
+++ /dev/null
@@ -1,436 +0,0 @@
-[
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-    "techniques": [
-      "F113"
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-    "date": "2025-06-02T17:10:48.000Z",
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-    "date": "2025-04-22T14:04:54.000Z",
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-    ],
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-    "date": "2025-04-22T14:04:54.000Z",
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-      "F47"
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-      "H70"
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-  {
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-    "techniques": [
-      "H75"
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-  {
-    "date": "2022-06-09T01:44:59.000Z",
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-    "techniques": [
-      "H60"
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-  {
-    "date": "2022-06-03T17:49:48.000Z",
-    "techniques": [
-      "H45"
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-  {
-    "date": "2022-06-01T17:54:32.000Z",
-    "techniques": [
-      "H35"
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-    "type": "removed"
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-    "date": "2022-05-31T23:21:08.000Z",
-    "techniques": [
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-  {
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-    "techniques": [
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-    "date": "2018-11-29T23:50:53.000Z",
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-    "date": "2018-11-29T23:27:21.000Z",
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-  {
-    "date": "2018-11-16T21:19:52.000Z",
-    "techniques": [
-      "C33",
-      "C34",
-      "C35",
-      "C36",
-      "C37"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-10-04T17:45:00.000Z",
-    "techniques": [
-      "ARIA23"
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-    "date": "2018-09-05T08:44:27.000Z",
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-  {
-    "date": "2018-09-05T08:37:35.000Z",
-    "techniques": [
-      "C32"
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-    "type": "added"
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-    "date": "2018-09-05T08:36:59.000Z",
-    "techniques": [
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-    "type": "added"
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-  {
-    "date": "2018-09-05T08:35:54.000Z",
-    "techniques": [
-      "F94"
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-    "type": "added"
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-  {
-    "date": "2018-08-14T22:38:17.000Z",
-    "techniques": [
-      "ARIA22"
-    ],
-    "type": "added"
-  }
-]
\ No newline at end of file
diff --git a/techniques/changelog.22.11tydata.json b/techniques/changelog.22.11tydata.json
deleted file mode 100644
index 9171ec2c06..0000000000
--- a/techniques/changelog.22.11tydata.json
+++ /dev/null
@@ -1,520 +0,0 @@
-[
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-    "date": "2023-02-10T17:43:14.000Z",
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-    "techniques": [
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-    "date": "2020-07-19T20:23:21.000Z",
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-    "date": "2019-08-01T21:45:55.000Z",
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-    "type": "added"
-  },
-  {
-    "date": "2019-06-18T09:35:43.000Z",
-    "techniques": [
-      "G212"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-06-11T21:40:12.000Z",
-    "techniques": [
-      "F98"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-05-22T22:22:09.000Z",
-    "techniques": [
-      "ARIA24"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-05-01T18:10:55.000Z",
-    "techniques": [
-      "G211"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-04-26T19:45:05.000Z",
-    "techniques": [
-      "F97"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-04-26T13:54:19.000Z",
-    "techniques": [
-      "G210"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-02-27T00:14:54.000Z",
-    "techniques": [
-      "G209"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-01-29T23:55:16.000Z",
-    "techniques": [
-      "G208"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-01-11T01:38:47.000Z",
-    "techniques": [
-      "C40"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2019-01-10T16:34:28.000Z",
-    "techniques": [
-      "C39"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-12-14T13:11:14.000Z",
-    "techniques": [
-      "G207"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-29T23:50:53.000Z",
-    "techniques": [
-      "F96"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-29T23:27:21.000Z",
-    "techniques": [
-      "F95"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-29T22:20:01.000Z",
-    "techniques": [
-      "C38"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-11-16T21:19:52.000Z",
-    "techniques": [
-      "C33",
-      "C34",
-      "C35",
-      "C36",
-      "C37"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-10-04T17:45:00.000Z",
-    "techniques": [
-      "ARIA23"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:44:27.000Z",
-    "techniques": [
-      "H98"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:37:35.000Z",
-    "techniques": [
-      "C32"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:36:59.000Z",
-    "techniques": [
-      "C31"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-09-05T08:35:54.000Z",
-    "techniques": [
-      "F94"
-    ],
-    "type": "added"
-  },
-  {
-    "date": "2018-08-14T22:38:17.000Z",
-    "techniques": [
-      "ARIA22"
-    ],
-    "type": "added"
-  }
-]
\ No newline at end of file

From f0979409f740c5e87f52c9b825f8a3a157abcd07 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Fri, 1 Aug 2025 14:58:30 -0400
Subject: [PATCH 06/14] Add changelog page and update other pages

---
 11ty/CustomLiquid.ts      |  2 +-
 techniques/changelog.html | 79 +++++++++++++++++++++++++++++++++++++++
 techniques/index.html     |  7 ++--
 understanding/about.html  |  2 +-
 4 files changed, 84 insertions(+), 6 deletions(-)
 create mode 100644 techniques/changelog.html

diff --git a/11ty/CustomLiquid.ts b/11ty/CustomLiquid.ts
index b1af277d28..9141345676 100644
--- a/11ty/CustomLiquid.ts
+++ b/11ty/CustomLiquid.ts
@@ -17,7 +17,7 @@ import { techniqueToUnderstandingLinkSelector } from "./understanding";
 const titleSuffix = " | WAI | W3C";
 
 /** Matches index and about pages, traditionally processed differently than individual pages */
-const indexPattern = /(techniques|understanding)\/(index|about)\.html$/;
+const indexPattern = /(techniques|understanding)\/(index|about|changelog)\.html$/;
 const techniquesPattern = /\btechniques\//;
 const understandingPattern = /\bunderstanding\//;
 
diff --git a/techniques/changelog.html b/techniques/changelog.html
new file mode 100644
index 0000000000..6a571629ae
--- /dev/null
+++ b/techniques/changelog.html
@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+
+  <title>WCAG {{ versionDecimal }} Techniques Change Log | WAI | W3C</title>
+  <link rel="stylesheet" href="https://w3.org/WAI/assets/css/style.css">
+  <link rel="stylesheet" type="text/css" href="base.css">
+</head>
+
+<body dir="ltr">
+  <div class="default-grid with-gap leftcol">
+    <aside class="box nav-hack sidebar standalone-resource__sidebar ">
+      <header class="box-h ">Page Contents</header>
+      <div class="box-i">
+        <nav aria-label="page contents" class="navtoc">
+          <ul>
+            <li><a href="#added">Added Techniques</a></li>
+            <li><a href="#removed">Removed Techniques</a></li>
+          </ul>
+        </nav>
+      </div>
+    </aside>
+
+    <main id="main" class="main-content standalone-resource__main">
+      <h1 id="title" class="title p-name">Techniques Change Log for WCAG {{ versionDecimal }}</h1>
+
+      <section id="added">
+        <h2>Added Techniques</h2>
+        <ul>
+          {% for entry in changelog[version] -%}
+            {%- if entry.type == "added" -%}
+              <li>
+                <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>:
+                {% if entry.techniques.size == 1 -%}
+                  Added {{ entry.techniques[0] | linkTechniques }}
+                {%- else -%}
+                  Added the following techniques:
+                  <ul>
+                    {%- for technique in entry.techniques -%}
+                      <li>{{ technique | linkTechniques }}</li>
+                    {%- endfor -%}
+                  </ul>
+                {%- endif %}
+              </li>
+            {%- endif -%}
+          {%- endfor %}
+        </ul>
+      </section>
+
+      <section id="removed">
+        <h2>Removed Techniques</h2>
+        <ul>
+          {% for entry in changelog[version] -%}
+            {%- if entry.type == "removed" -%}
+              <li>
+                <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>:
+                {% if entry.techniques.size == 1 -%}
+                  Removed {{ entry.techniques[0] }}
+                {%- else -%}
+                  Removed the following techniques:
+                  <ul>
+                    {%- for technique in entry.techniques -%}
+                      <li>{{ technique }}</li>
+                    {%- endfor -%}
+                  </ul>
+                {%- endif %}
+              </li>
+            {%- endif -%}
+          {%- endfor %}
+        </ul>
+      </section>
+    </main>
+  </div>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/techniques/index.html b/techniques/index.html
index e5f5ff39ec..c9fc7b3bee 100644
--- a/techniques/index.html
+++ b/techniques/index.html
@@ -42,13 +42,12 @@ <h1 id="title" class="title p-name">Techniques for WCAG {{ versionDecimal }}</h1
 			</div>
 		</aside>
 		
-		<div data-include="toc.html" data-include-replace="true"></div>
+		{% include "toc.html" %}
 
 		<section id="changelog">
 			<h2>Change Log</h2>
-			<p>A list of new, removed or significantly updated techniques:</p>
-			{% include "techniques/changelog/{{ version }}.html" %}
-			<p>For a more detailed view of recent changes to the informative documents see the <a href="https://github.com/w3c/wcag/commits/master">github updates</a>.</p>
+			<p>See the <a href="changelog.html">Techniques Change Log</a> for a list of new, removed or significantly updated techniques.</p>
+			<p>For a more detailed view of recent changes to the informative documents see the <a href="https://github.com/w3c/wcag/commits/main">github updates</a>.</p>
 		</section>
 				<a class="button button-backtotop" href="#top"><span><svg focusable="false" aria-hidden="true" class="icon-arrow-up " viewBox="0 0 26 28">
 					<path d="M25.172 15.172c0 0.531-0.219 1.031-0.578 1.406l-1.172 1.172c-0.375 0.375-0.891 0.594-1.422 0.594s-1.047-0.219-1.406-0.594l-4.594-4.578v11c0 1.125-0.938 1.828-2 1.828h-2c-1.062 0-2-0.703-2-1.828v-11l-4.594 4.578c-0.359 0.375-0.875 0.594-1.406 0.594s-1.047-0.219-1.406-0.594l-1.172-1.172c-0.375-0.375-0.594-0.875-0.594-1.406s0.219-1.047 0.594-1.422l10.172-10.172c0.359-0.375 0.875-0.578 1.406-0.578s1.047 0.203 1.422 0.578l10.172 10.172c0.359 0.375 0.578 0.891 0.578 1.422z"></path></svg> Back to Top
diff --git a/understanding/about.html b/understanding/about.html
index 3d12af7c73..89b08d3f8f 100644
--- a/understanding/about.html
+++ b/understanding/about.html
@@ -76,7 +76,7 @@ <h3>Structure of the Documents</h3>
       <section id="changelog">
         <details>
           <summary><h2>Change Log</h2></summary>
-          <p>For a detailed view of recent changes to the informative documents see the <a href="https://github.com/w3c/wcag/commits/master">github updates</a>.</p>
+          <p>For a detailed view of recent changes to the informative documents see the <a href="https://github.com/w3c/wcag/commits/main">github updates</a>.</p>
         </details>
       </section>
 

From 4cdce12f95bf3162585f9fa71ab89ffed217fdcb Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Fri, 1 Aug 2025 23:53:39 -0400
Subject: [PATCH 07/14] Implement displaying titles for removed techniques in
 changelog

---
 11ty/data-dependencies.ts |  6 +++++-
 eleventy.config.ts        | 15 +++++++++++++++
 techniques/changelog.html |  4 ++--
 3 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/11ty/data-dependencies.ts b/11ty/data-dependencies.ts
index a3aca5847a..b74d6af849 100644
--- a/11ty/data-dependencies.ts
+++ b/11ty/data-dependencies.ts
@@ -38,6 +38,9 @@ export async function loadDataDependencies(version?: string) {
     return await getPrinciplesForVersion(definedVersion);
   }
 
+  // Note: many of these variables are documented in the return value instead of up-front,
+  // in order to provide docs to consumers of this function
+
   const principles = await resolveRelevantPrinciples();
   const flatGuidelines = getFlatGuidelines(principles);
   /** Flattened Principles/Guidelines/SC that only exist in later versions (to filter techniques) */
@@ -59,7 +62,8 @@ export async function loadDataDependencies(version?: string) {
   for (const [id, associations] of Object.entries(techniqueAssociations)) {
     // Prune associations from non-obsolete techniques to obsolete SCs
     techniqueAssociations[id] = associations.filter(
-      ({ criterion }) => criterion.level !== "" || isTechniqueObsolete(flatTechniques[id], definedVersion)
+      ({ criterion }) =>
+        criterion.level !== "" || isTechniqueObsolete(flatTechniques[id], definedVersion)
     );
   }
 
diff --git a/eleventy.config.ts b/eleventy.config.ts
index 6304315ae1..e21c7cf78b 100644
--- a/eleventy.config.ts
+++ b/eleventy.config.ts
@@ -307,6 +307,21 @@ export default async function (eleventyConfig: any) {
     }
   );
 
+  // Filter that transforms a technique ID into its title (even if it is obsolete, e.g. for changelog)
+  eleventyConfig.addFilter("displayTechniqueTitle", function (this: EleventyContext, id: string) {
+    const technique = flatTechniques[id];
+    if (!technique) {
+      if (process.env.WCAG_VERBOSE) {
+        console.warn(
+          `displayTechniqueTitle in ${this.page.inputPath}: ` +
+            `skipping unresolvable technique id ${id}`
+        );
+      }
+      return;
+    }
+    return `${id}: ${technique.truncatedTitle}`;
+  });
+
   // Filter that transforms a guideline or SC shortname (or list of them) into links to their pages.
   eleventyConfig.addFilter(
     "linkUnderstanding",
diff --git a/techniques/changelog.html b/techniques/changelog.html
index 6a571629ae..847d070dcb 100644
--- a/techniques/changelog.html
+++ b/techniques/changelog.html
@@ -58,12 +58,12 @@ <h2>Removed Techniques</h2>
               <li>
                 <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>:
                 {% if entry.techniques.size == 1 -%}
-                  Removed {{ entry.techniques[0] }}
+                  Removed {{ entry.techniques[0] | displayTechniqueTitle | default: entry.techniques[0] }}
                 {%- else -%}
                   Removed the following techniques:
                   <ul>
                     {%- for technique in entry.techniques -%}
-                      <li>{{ technique }}</li>
+                      <li>{{ technique | displayTechniqueTitle | default: technique }}</li>
                     {%- endfor -%}
                   </ul>
                 {%- endif %}

From f4a316ea890a9153b04a5b0ae6fe21b5ff62f61e Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Mon, 4 Aug 2025 08:09:59 -0400
Subject: [PATCH 08/14] Add commit hash to each changelog entry

---
 11ty/generate-techniques-changelog-data.ts |  80 +++++++------
 techniques/changelog.11tydata.json         | 133 +++++++++++++++++++++
 techniques/changelog.html                  |   6 +-
 3 files changed, 179 insertions(+), 40 deletions(-)

diff --git a/11ty/generate-techniques-changelog-data.ts b/11ty/generate-techniques-changelog-data.ts
index 036d7fbb49..85f073c31d 100644
--- a/11ty/generate-techniques-changelog-data.ts
+++ b/11ty/generate-techniques-changelog-data.ts
@@ -1,17 +1,9 @@
-// TODOs:
-// - Handle running for 2.1 vs. 2.2 (would probably be easier by reusing techniques.ts, either as part of 11ty build or otherwise)
-// - Create techniques/changelog.html template, migrating changelog out of techniques/index.html
-//   - Ideally use {{ linkTechniques | ... }} for additions; removals should get titles but shouldn't link
-//     - Create cousin `labelTechnique` filter that only applies title logic w/o link?
-// - Figure out workflow story (i.e. when do we run this? Could do it ahead of w3c build...)
-
 import { exec } from "child_process";
 import { access, readFile, writeFile } from "fs/promises";
 import { glob } from "glob";
 import { basename, join } from "path";
 import { promisify } from "util";
 
-import { resolveDecimalVersion } from "./common";
 import type { WcagVersion } from "./guidelines";
 import { technologies, technologyTitles } from "./techniques";
 import { loadDataDependencies } from "./data-dependencies";
@@ -28,6 +20,7 @@ const sinceDate = new Date(2018, 5, 6);
 
 interface Entry {
   date: Date;
+  hash: string;
   technique: string;
   type: "added" | "removed";
 }
@@ -47,33 +40,45 @@ const checkTechnique = async (path: string) =>
     () => false
   );
 
-function resolveEarliestDate(a: Date | null, b: Date | null) {
-  if (a && b) return new Date(Math.min(+a, +b));
+function resolveEarliest(a: EarliestInfo | null, b: EarliestInfo | null) {
+  if (a && b) {
+    if (a.date > b.date) return b;
+    return a;
+  }
   if (a || b) return a || b;
   return null;
 }
 
+interface EarliestInfo {
+  date: Date;
+  hash: string;
+}
+
 // Cache getEarliestDate results to save time processing across versions
-const earliestDateCache: Record<string, Date | null> = {};
+const earliestCache: Record<string, EarliestInfo | null> = {};
 
 // Common function called by getEarlest...Date functions below
-async function getEarliestDate(path: string, logArgs: string) {
+async function getEarliest(path: string, logArgs: string) {
   const cacheKey = `${path} ${logArgs}`;
-  if (!(cacheKey in earliestDateCache)) {
-    const command = `git log ${logArgs} --format=%ad --date=iso-strict -- ${path} | tail -1`;
+  if (!(cacheKey in earliestCache)) {
+    const command = `git log ${logArgs} --format='%h %ad' --date=iso-strict -- ${path} | tail -1`;
     const output = (await execAsync(command)).stdout.trim();
-    earliestDateCache[cacheKey] = output ? new Date(output) : null;
+    if (output) {
+      const match = /^(\w+) (.+)$/.exec(output);
+      if (!match) throw new Error("Unexpected git log output format");
+      earliestCache[cacheKey] = { date: new Date(match[2]), hash: match[1] };
+    } else earliestCache[cacheKey] = null;
   }
-  return earliestDateCache[cacheKey];
+  return earliestCache[cacheKey];
 }
 
 // --diff-filter=A is NOT used for additions because it misses odd merge commit cases e.g. F99.
 // (Not using it seems to have negligible performance difference and causes no other changes.)
-const getEarliestAdditionDate = (path: string) => getEarliestDate(path, "");
-const getEarliestRemovalDate = (path: string) => getEarliestDate(path, "--diff-filter=D");
-const getEarliestObsolescenceDate = (path: string, version: WcagVersion) => {
+const getEarliestAddition = (path: string) => getEarliest(path, "");
+const getEarliestRemoval = (path: string) => getEarliest(path, "--diff-filter=D");
+const getEarliestObsolescence = (path: string, version: WcagVersion) => {
   const valuePattern = `2[0-${version[1]}]`;
-  return getEarliestDate(
+  return getEarliest(
     path,
     `-G'${
       path.endsWith(".json")
@@ -95,18 +100,17 @@ async function generateChangelog(version: WcagVersion) {
     if (!techniquesFiles.length) continue;
 
     const code = techniquesFiles[0].replace(/\d+\.html$/, "");
-    const technologyObsolescenceDate = await getEarliestObsolescenceDate(
+    const technologyObsolescence = await getEarliestObsolescence(
       join(techniquesPath, `${technology}.11tydata.json`),
       version
     );
-    if (technologyObsolescenceDate && technologyObsolescenceDate > sinceDate) {
+    if (technologyObsolescence && technologyObsolescence.date > sinceDate) {
       // The above check can handle future cases of marking an entire folder as obsolete;
       // for legacy cases (Flash/SL), check the first technique file for removal
-      const technologyRemovalDate = await getEarliestRemovalDate(
-        join(techniquesPath, `${code}1.html`)
-      );
+      const technologyRemoval = await getEarliestRemoval(join(techniquesPath, `${code}1.html`));
       entries.push({
-        date: technologyRemovalDate || technologyObsolescenceDate,
+        date: (technologyRemoval || technologyObsolescence).date,
+        hash: (technologyRemoval || technologyObsolescence).hash,
         technique: `all ${technologyTitles[technology]}`,
         type: "removed",
       });
@@ -123,24 +127,24 @@ async function generateChangelog(version: WcagVersion) {
       const technique = basename(techniquePath, ".html");
       if (technique in excludes || technique in futureExclusiveTechniqueAssociations) continue;
 
-      const additionDate = await getEarliestAdditionDate(techniquePath);
-      if (!additionDate) continue; // Skip if added prior to start date
-      if (additionDate > sinceDate)
+      const addition = await getEarliestAddition(techniquePath);
+      if (!addition) continue; // Skip if added prior to start date
+      if (addition.date > sinceDate)
         entries.push({
-          date: additionDate,
+          ...addition,
           technique,
           type: "added",
         });
 
-      const removalDate = (await checkTechnique(techniquePath))
+      const removal = (await checkTechnique(techniquePath))
         ? null
-        : resolveEarliestDate(
-            await getEarliestRemovalDate(techniquePath),
-            await getEarliestObsolescenceDate(techniquePath, version)
+        : resolveEarliest(
+            await getEarliestRemoval(techniquePath),
+            await getEarliestObsolescence(techniquePath, version)
           );
-      if (removalDate && removalDate > sinceDate)
+      if (removal && removal.date > sinceDate)
         entries.push({
-          date: removalDate,
+          ...removal,
           technique,
           type: "removed",
         });
@@ -156,11 +160,11 @@ async function generateChangelog(version: WcagVersion) {
     return 0;
   });
 
-  return entries.reduce((collectedEntries, { date, technique, type }) => {
+  return entries.reduce((collectedEntries, { date, hash, technique, type }) => {
     const previousEntry = collectedEntries[collectedEntries.length - 1];
     if (previousEntry && previousEntry.type === type && +previousEntry.date === +date)
       previousEntry.techniques.push(technique);
-    else collectedEntries.push({ date, techniques: [technique], type });
+    else collectedEntries.push({ date, hash, techniques: [technique], type });
     return collectedEntries;
   }, [] as CompoundEntry[]);
 }
diff --git a/techniques/changelog.11tydata.json b/techniques/changelog.11tydata.json
index 3a3de9eb5b..04d9fbf637 100644
--- a/techniques/changelog.11tydata.json
+++ b/techniques/changelog.11tydata.json
@@ -4,6 +4,7 @@
     "21": [
       {
         "date": "2025-06-20T14:07:03.000Z",
+        "hash": "e94108df2",
         "techniques": [
           "F113"
         ],
@@ -11,6 +12,7 @@
       },
       {
         "date": "2025-06-02T17:10:48.000Z",
+        "hash": "77f6235f0",
         "techniques": [
           "G226"
         ],
@@ -18,6 +20,7 @@
       },
       {
         "date": "2025-04-22T14:04:54.000Z",
+        "hash": "8267b5984",
         "techniques": [
           "F112"
         ],
@@ -25,6 +28,7 @@
       },
       {
         "date": "2025-04-22T14:04:54.000Z",
+        "hash": "8267b5984",
         "techniques": [
           "F4",
           "F47"
@@ -33,6 +37,7 @@
       },
       {
         "date": "2025-03-07T18:04:01.000Z",
+        "hash": "1736b7bf1",
         "techniques": [
           "G224",
           "G225"
@@ -41,6 +46,7 @@
       },
       {
         "date": "2024-06-12T13:24:09.000Z",
+        "hash": "7f4cb89d3",
         "techniques": [
           "F87"
         ],
@@ -48,6 +54,7 @@
       },
       {
         "date": "2024-05-14T17:38:58.000Z",
+        "hash": "a2b2f2204",
         "techniques": [
           "C45"
         ],
@@ -55,6 +62,7 @@
       },
       {
         "date": "2024-04-30T18:40:09.000Z",
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         "date": "2022-05-20T19:47:40.000Z",
+        "hash": "10c62159d",
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+        "hash": "c9c2a7b8d",
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@@ -779,6 +887,7 @@
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@@ -793,6 +903,7 @@
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@@ -800,6 +911,7 @@
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         "date": "2019-06-11T21:40:12.000Z",
+        "hash": "b516a6e25",
         "techniques": [
           "F98"
         ],
@@ -821,6 +935,7 @@
       },
       {
         "date": "2019-05-22T22:22:09.000Z",
+        "hash": "422687fe7",
         "techniques": [
           "ARIA24"
         ],
@@ -828,6 +943,7 @@
       },
       {
         "date": "2019-05-01T18:10:55.000Z",
+        "hash": "190489a9f",
         "techniques": [
           "G211"
         ],
@@ -835,6 +951,7 @@
       },
       {
         "date": "2019-04-26T19:45:05.000Z",
+        "hash": "b78678077",
         "techniques": [
           "F97"
         ],
@@ -842,6 +959,7 @@
       },
       {
         "date": "2019-04-26T13:54:19.000Z",
+        "hash": "7d164802b",
         "techniques": [
           "G210"
         ],
@@ -849,6 +967,7 @@
       },
       {
         "date": "2019-02-27T00:14:54.000Z",
+        "hash": "c4e396ac0",
         "techniques": [
           "G209"
         ],
@@ -856,6 +975,7 @@
       },
       {
         "date": "2019-01-29T23:55:16.000Z",
+        "hash": "0bbd57b58",
         "techniques": [
           "G208"
         ],
@@ -863,6 +983,7 @@
       },
       {
         "date": "2019-01-11T01:38:47.000Z",
+        "hash": "d9e8d71fc",
         "techniques": [
           "C40"
         ],
@@ -870,6 +991,7 @@
       },
       {
         "date": "2019-01-10T16:34:28.000Z",
+        "hash": "c9f19d9d3",
         "techniques": [
           "C39"
         ],
@@ -877,6 +999,7 @@
       },
       {
         "date": "2018-12-14T13:11:14.000Z",
+        "hash": "4d24c554c",
         "techniques": [
           "G207"
         ],
@@ -884,6 +1007,7 @@
       },
       {
         "date": "2018-11-29T23:50:53.000Z",
+        "hash": "20deabc71",
         "techniques": [
           "F96"
         ],
@@ -891,6 +1015,7 @@
       },
       {
         "date": "2018-11-29T23:27:21.000Z",
+        "hash": "ae4028cdf",
         "techniques": [
           "F95"
         ],
@@ -898,6 +1023,7 @@
       },
       {
         "date": "2018-11-29T22:20:01.000Z",
+        "hash": "8c78e4bf2",
         "techniques": [
           "C38"
         ],
@@ -905,6 +1031,7 @@
       },
       {
         "date": "2018-11-16T21:19:52.000Z",
+        "hash": "8bcaeddbe",
         "techniques": [
           "C33",
           "C34",
@@ -916,6 +1043,7 @@
       },
       {
         "date": "2018-10-04T17:45:00.000Z",
+        "hash": "4b64764d2",
         "techniques": [
           "ARIA23"
         ],
@@ -923,6 +1051,7 @@
       },
       {
         "date": "2018-09-05T08:44:27.000Z",
+        "hash": "bd14cbef3",
         "techniques": [
           "H98"
         ],
@@ -930,6 +1059,7 @@
       },
       {
         "date": "2018-09-05T08:37:35.000Z",
+        "hash": "9681bd9c2",
         "techniques": [
           "C32"
         ],
@@ -937,6 +1067,7 @@
       },
       {
         "date": "2018-09-05T08:36:59.000Z",
+        "hash": "b67a6fdd1",
         "techniques": [
           "C31"
         ],
@@ -944,6 +1075,7 @@
       },
       {
         "date": "2018-09-05T08:35:54.000Z",
+        "hash": "2e7e39aab",
         "techniques": [
           "F94"
         ],
@@ -951,6 +1083,7 @@
       },
       {
         "date": "2018-08-14T22:38:17.000Z",
+        "hash": "70a21c88b",
         "techniques": [
           "ARIA22"
         ],
diff --git a/techniques/changelog.html b/techniques/changelog.html
index 847d070dcb..625ac31e0a 100644
--- a/techniques/changelog.html
+++ b/techniques/changelog.html
@@ -33,7 +33,8 @@ <h2>Added Techniques</h2>
           {% for entry in changelog[version] -%}
             {%- if entry.type == "added" -%}
               <li>
-                <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>:
+                <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>
+                (<a href="https://github.com/w3c/wcag/commit/{{ entry.hash }}">{{ entry.hash }}</a>):
                 {% if entry.techniques.size == 1 -%}
                   Added {{ entry.techniques[0] | linkTechniques }}
                 {%- else -%}
@@ -56,7 +57,8 @@ <h2>Removed Techniques</h2>
           {% for entry in changelog[version] -%}
             {%- if entry.type == "removed" -%}
               <li>
-                <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>:
+                <time datetime="{{ entry.date }}">{{ entry.date | date: "%d %B %Y" }}</time>
+                (<a href="https://github.com/w3c/wcag/commit/{{ entry.hash }}">{{ entry.hash }}</a>):
                 {% if entry.techniques.size == 1 -%}
                   Removed {{ entry.techniques[0] | displayTechniqueTitle | default: entry.techniques[0] }}
                 {%- else -%}

From ee15bb07651c74b393d7806af1e7cb42e793c823 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Mon, 4 Aug 2025 08:14:22 -0400
Subject: [PATCH 09/14] Rephrase changelog paragraph to accurately reflect what
 it contains

---
 techniques/index.html | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/techniques/index.html b/techniques/index.html
index c9fc7b3bee..a6eb2156c3 100644
--- a/techniques/index.html
+++ b/techniques/index.html
@@ -46,7 +46,7 @@ <h1 id="title" class="title p-name">Techniques for WCAG {{ versionDecimal }}</h1
 
 		<section id="changelog">
 			<h2>Change Log</h2>
-			<p>See the <a href="changelog.html">Techniques Change Log</a> for a list of new, removed or significantly updated techniques.</p>
+			<p>See the <a href="changelog.html">Techniques Change Log</a> for a list of new and removed techniques.</p>
 			<p>For a more detailed view of recent changes to the informative documents see the <a href="https://github.com/w3c/wcag/commits/main">github updates</a>.</p>
 		</section>
 				<a class="button button-backtotop" href="#top"><span><svg focusable="false" aria-hidden="true" class="icon-arrow-up " viewBox="0 0 26 28">

From 9689b02a7a5a636aa13f25a85fb655becf881942 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Mon, 4 Aug 2025 08:56:27 -0400
Subject: [PATCH 10/14] Remove old changelog includes that are no longer used

---
 _includes/techniques/changelog/21.html | 42 --------------------------
 _includes/techniques/changelog/22.html | 42 --------------------------
 2 files changed, 84 deletions(-)
 delete mode 100644 _includes/techniques/changelog/21.html
 delete mode 100644 _includes/techniques/changelog/22.html

diff --git a/_includes/techniques/changelog/21.html b/_includes/techniques/changelog/21.html
deleted file mode 100644
index 8c4502d903..0000000000
--- a/_includes/techniques/changelog/21.html
+++ /dev/null
@@ -1,42 +0,0 @@
-<ol>
-  <li><time datetime="2025-06-02">2 Jun 2025</time>: Added {{ "G226" | linkTechniques }}</li>
-  <li><time datetime="2025-05-19">19 May 2025</time>: Added {{ "SCR40" | linkTechniques }}</li>
-  <li><time datetime="2025-04-22">22 Apr 2025</time>: Added {{ "F112" | linkTechniques }}</li>
-  <li><time datetime="2025-04-22">22 Apr 2025</time>: Removed F4 Failure of Success Criterion 2.2.2 due to using text-decoration:blink without a mechanism to stop it in less than five seconds</li>
-  <li><time datetime="2025-04-22">22 Apr 2025</time>: Removed F47 Failure of Success Criterion 2.2.2 due to using the blink element</li>
-  <li><time datetime="2025-03-07">7 Mar 2025</time>: Added {{ "G224" | linkTechniques }}</li>
-  <li><time datetime="2025-03-07">7 Mar 2025</time>: Added {{ "G225" | linkTechniques }}</li>
-  <li><time datetime="2024-05-04">4 May 2024</time>: Removed F87 Failure of Success Criterion 1.3.1 due to inserting non-decorative content by using :before and :after pseudo-elements and the 'content' property in CSS</li>
-  <li><time datetime="2020-07-15">15 July 2020</time>: Removed Flash techniques</li>
-  <li><time datetime="2019-09-12">12 Sept 2019</time>: Added {{ "F105" | linkTechniques }}</li>
-  <li><time datetime="2019-09-12">12 Sept 2019</time>: Added {{ "F106" | linkTechniques }}</li>
-  <li><time datetime="2019-09-03">3 Sept 2019</time>: Added {{ "F104" | linkTechniques }}</li>
-  <li><time datetime="2019-09-03">3 Sept 2019</time>: Added {{ "F103" | linkTechniques }}</li>
-  <li><time datetime="2019-08-06">6 Aug 2019</time>: Added {{ "F102" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "G216" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "G215" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "F100" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "G214" | linkTechniques }}</li>
-  <li><time datetime="2019-07-10">10 Jul 2019</time>: Added {{ "C40" | linkTechniques }}</li>
-  <li><time datetime="2019-07-10">10 Jul 2019</time>: Added {{ "F99" | linkTechniques }}</li>
-  <li><time datetime="2019-07-10">10 Jul 2019</time>: Added {{ "SCR39" | linkTechniques }}</li>
-  <li><time datetime="2019-06-18">18 Jun 2019</time>: Added {{ "G212" | linkTechniques }}</li>
-  <li><time datetime="2019-06-11">Jun 11 2019</time>: Added {{ "F98" | linkTechniques }}</li>
-  <li><time datetime="2019-06-18">18 Jun 2019</time>: Added {{ "G213" | linkTechniques }}</li>
-  <li><time datetime="2019-05-25">25 May 2019</time>: Added {{ "ARIA24" | linkTechniques }}</li>
-  <li><time datetime="2019-04-20">26 Apr 2019</time>: Added {{ "F97" | linkTechniques }}</li>
-  <li><time datetime="2019-02-26">26 Feb 2019</time>: Removed {{ "F52" | linkTechniques }} from SC 3.2.1 (still attached to SC 3.2.5)</li>
-  <li><time datetime="2019-02-26">26 Feb 2019</time>: Added {{ "G209" | linkTechniques }}</li>
-  <li><time datetime="2019-01-10">10 Jan 2019</time>: Added {{ "C39" | linkTechniques }}</li>
-  <li><time datetime="2018-12-14">14 Dec 2018</time>: Added {{ "G207" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">30 Nov 2018</time>: Added {{ "C38" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "F95" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">13 Nov 2018</time>: Added {{ "C34" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">13 Nov 2018</time>: Added {{ "C36" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">13 Nov 2018</time>: Added {{ "C37" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "G207" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "F95" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "F96" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "C38" | linkTechniques }}</li>
-  <li><time datetime="2018-12-14">14 Dec 2018</time>: Added {{ "G207" | linkTechniques }}</li>
-</ol>
diff --git a/_includes/techniques/changelog/22.html b/_includes/techniques/changelog/22.html
deleted file mode 100644
index 42d573bfd5..0000000000
--- a/_includes/techniques/changelog/22.html
+++ /dev/null
@@ -1,42 +0,0 @@
-<ol>
-  <li><time datetime="2025-04-22">2 Jun 2025</time>: Added {{ "G226" | linkTechniques }}</li>
-  <li><time datetime="2025-05-19">19 May 2025</time>: Added {{ "SCR40" | linkTechniques }}</li>
-  <li><time datetime="2025-04-22">22 Apr 2025</time>: Added {{ "F112" | linkTechniques }}</li>
-  <li><time datetime="2025-04-22">22 Apr 2025</time>: Removed F4 Failure of Success Criterion 2.2.2 due to using text-decoration:blink without a mechanism to stop it in less than five seconds</li>
-  <li><time datetime="2025-04-22">22 Apr 2025</time>: Removed F47 Failure of Success Criterion 2.2.2 due to using the blink element</li>
-  <li><time datetime="2025-03-07">7 Mar 2025</time>: Added {{ "G224" | linkTechniques }}</li>
-  <li><time datetime="2025-03-07">7 Mar 2025</time>: Added {{ "G225" | linkTechniques }}</li>
-  <li><time datetime="2024-05-04">4 May 2024</time>: Removed F87 Failure of Success Criterion 1.3.1 due to inserting non-decorative content by using :before and :after pseudo-elements and the 'content' property in CSS</li>
-  <li><time datetime="2020-07-15">15 July 2020</time>: Removed Flash techniques</li>
-  <li><time datetime="2019-09-12">12 Sept 2019</time>: Added {{ "F105" | linkTechniques }}</li>
-  <li><time datetime="2019-09-12">12 Sept 2019</time>: Added {{ "F106" | linkTechniques }}</li>
-  <li><time datetime="2019-09-03">3 Sept 2019</time>: Added {{ "F104" | linkTechniques }}</li>
-  <li><time datetime="2019-09-03">3 Sept 2019</time>: Added {{ "F103" | linkTechniques }}</li>
-  <li><time datetime="2019-08-06">6 Aug 2019</time>: Added {{ "F102" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "G216" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "G215" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "F100" | linkTechniques }}</li>
-  <li><time datetime="2019-07-16">16 Jul 2019</time>: Added {{ "G214" | linkTechniques }}</li>
-  <li><time datetime="2019-07-10">10 Jul 2019</time>: Added {{ "C40" | linkTechniques }}</li>
-  <li><time datetime="2019-07-10">10 Jul 2019</time>: Added {{ "F99" | linkTechniques }}</li>
-  <li><time datetime="2019-07-10">10 Jul 2019</time>: Added {{ "SCR39" | linkTechniques }}</li>
-  <li><time datetime="2019-06-18">18 Jun 2019</time>: Added {{ "G212" | linkTechniques }}</li>
-  <li><time datetime="2019-06-11">Jun 11 2019</time>: Added {{ "F98" | linkTechniques }}</li>
-  <li><time datetime="2019-06-18">18 Jun 2019</time>: Added {{ "G213" | linkTechniques }}</li>
-  <li><time datetime="2019-05-25">25 May 2019</time>: Added {{ "ARIA24" | linkTechniques }}</li>
-  <li><time datetime="2019-04-20">26 Apr 2019</time>: Added {{ "F97" | linkTechniques }}</li>
-  <li><time datetime="2019-02-26">26 Feb 2019</time>: Removed {{ "F52" | linkTechniques }} from SC 3.2.1 (still attached to SC 3.2.5)</li>
-  <li><time datetime="2019-02-26">26 Feb 2019</time>: Added {{ "G209" | linkTechniques }}</li>
-  <li><time datetime="2019-01-10">10 Jan 2019</time>: Added {{ "C39" | linkTechniques }}</li>
-  <li><time datetime="2018-12-14">14 Dec 2018</time>: Added {{ "G207" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">30 Nov 2018</time>: Added {{ "C38" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "F95" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">13 Nov 2018</time>: Added {{ "C34" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">13 Nov 2018</time>: Added {{ "C36" | linkTechniques }}</li>
-  <li><time datetime="2018-11-13">13 Nov 2018</time>: Added {{ "C37" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "G207" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "F95" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "F96" | linkTechniques }}</li>
-  <li><time datetime="2018-11-30">30 Nov 2018</time>: Added {{ "C38" | linkTechniques }}</li>
-  <li><time datetime="2018-12-14">14 Dec 2018</time>: Added {{ "G207" | linkTechniques }}</li>
-</ol>

From bf30e69b5fe2c13e5aee5b4cde91ce0b90a4b987 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Mon, 4 Aug 2025 08:57:30 -0400
Subject: [PATCH 11/14] Add package.json script, update READMEs

---
 11ty/README.md | 3 ++-
 README.md      | 5 ++---
 package.json   | 1 +
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/11ty/README.md b/11ty/README.md
index 60695a01a6..7aacba7300 100644
--- a/11ty/README.md
+++ b/11ty/README.md
@@ -23,10 +23,11 @@ Common tasks:
   - http://localhost:8080/techniques
   - http://localhost:8080/understanding
 
-Maintenance tasks (for working with Eleventy config and supporting files under this subdirectory):
+Maintenance tasks (for working with Eleventy config and supporting files used by the build):
 
 - `npm run check` checks for TypeScript errors
 - `npm run fmt` formats all TypeScript files
+- `npm run changelog` generates data for the Techniques Change Log
 
 ## Environment Variables
 
diff --git a/README.md b/README.md
index 47ccc449c3..9c6d26d9d4 100644
--- a/README.md
+++ b/README.md
@@ -219,9 +219,8 @@ appended to the "Note" title in applicable versions, and the note will be hidden
 
 ### Techniques Change Log
 
-At the time of writing (November 2024), the Change Log in the Techniques index is identical between WCAG 2.1 and 2.2.
-These have been split out into separate version-specific includes under `_includes/techniques/changelog/*.html`
-for future-proofing in support of building multiple versions of informative documents from the same branch.
+Data for the Techniques Change Log is now generated automatically by a script that reads git history;
+see [Eleventy Usage](11ty/README.md#usage).
 
 ## Working Examples
 
diff --git a/package.json b/package.json
index a2f3b44ec6..a20da639e7 100644
--- a/package.json
+++ b/package.json
@@ -8,6 +8,7 @@
     "build": "tsx node_modules/@11ty/eleventy/cmd.cjs --config=eleventy.config.ts",
     "check": "tsc",
     "fmt": "prettier . -w",
+    "changelog": "tsx 11ty/generate-techniques-changelog-data.ts",
     "publish-w3c": "WCAG_VERSION=22 WCAG_JSON=1 WCAG_MODE=publication npm run build && tsx 11ty/cp-cvs.ts",
     "publish-w3c:21": "WCAG_VERSION=21 WCAG_JSON=1 WCAG_MODE=publication npm run build && WCAG_VERSION=21 tsx 11ty/cp-cvs.ts",
     "start": "tsx watch node_modules/@11ty/eleventy/cmd.cjs --config=eleventy.config.ts --serve --incremental"

From c7ec9ac0d5a0ad9198b649bffa53bc7f61163a67 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Mon, 4 Aug 2025 09:14:30 -0400
Subject: [PATCH 12/14] Add missing end-of-page boilerplate to match
 techniques/index.html

---
 techniques/changelog.html | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/techniques/changelog.html b/techniques/changelog.html
index 625ac31e0a..fe1da3502a 100644
--- a/techniques/changelog.html
+++ b/techniques/changelog.html
@@ -74,8 +74,15 @@ <h2>Removed Techniques</h2>
           {%- endfor %}
         </ul>
       </section>
+      <a class="button button-backtotop" href="#top"><span><svg focusable="false" aria-hidden="true" class="icon-arrow-up " viewBox="0 0 26 28">
+        <path d="M25.172 15.172c0 0.531-0.219 1.031-0.578 1.406l-1.172 1.172c-0.375 0.375-0.891 0.594-1.422 0.594s-1.047-0.219-1.406-0.594l-4.594-4.578v11c0 1.125-0.938 1.828-2 1.828h-2c-1.062 0-2-0.703-2-1.828v-11l-4.594 4.578c-0.359 0.375-0.875 0.594-1.406 0.594s-1.047-0.219-1.406-0.594l-1.172-1.172c-0.375-0.375-0.594-0.875-0.594-1.406s0.219-1.047 0.594-1.422l10.172-10.172c0.359-0.375 0.875-0.578 1.406-0.578s1.047 0.203 1.422 0.578l10.172 10.172c0.359 0.375 0.578 0.891 0.578 1.422z"></path></svg> Back to Top
+      </span></a>
     </main>
   </div>
+  <script>
+    var translationStrings = {}; /* fix WAI JS */
+  </script>
+  <script src="https://www.w3.org/WAI/assets/scripts/main.js"></script>
 </body>
 
 </html>
\ No newline at end of file

From c11e2ddcbf3c64fea9721f1409c2dc9bd25ca423 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Thu, 7 Aug 2025 11:59:31 -0400
Subject: [PATCH 13/14] Integrate into publish-w3c scripts; further update to
 11ty/README.md

---
 11ty/README.md | 15 ++++++++++++++-
 package.json   |  4 ++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/11ty/README.md b/11ty/README.md
index 7aacba7300..295db011a8 100644
--- a/11ty/README.md
+++ b/11ty/README.md
@@ -27,7 +27,20 @@ Maintenance tasks (for working with Eleventy config and supporting files used by
 
 - `npm run check` checks for TypeScript errors
 - `npm run fmt` formats all TypeScript files
-- `npm run changelog` generates data for the Techniques Change Log
+
+## Publishing to WAI website
+
+The following npm scripts can be used to assist with publishing updates to the WAI website:
+
+- `npm run publish-w3c` to publish 2.2
+- `npm run publish-w3c:21` to publish 2.1
+
+Each of these scripts performs the following steps:
+
+1. Updates the data used for the Techniques Change Log page
+   - Note that this step may result in changes to `techniques/changelog.11tydata.json`, which should be committed to `main`
+2. Runs the build for the appropriate WCAG version, generating pages and `wcag.json` under `_site`
+3. Copies the built files from `_site` to the CVS checkout (see [`WCAG_CVSDIR`](#wcag_cvsdir))
 
 ## Environment Variables
 
diff --git a/package.json b/package.json
index a20da639e7..30b422b8f9 100644
--- a/package.json
+++ b/package.json
@@ -9,8 +9,8 @@
     "check": "tsc",
     "fmt": "prettier . -w",
     "changelog": "tsx 11ty/generate-techniques-changelog-data.ts",
-    "publish-w3c": "WCAG_VERSION=22 WCAG_JSON=1 WCAG_MODE=publication npm run build && tsx 11ty/cp-cvs.ts",
-    "publish-w3c:21": "WCAG_VERSION=21 WCAG_JSON=1 WCAG_MODE=publication npm run build && WCAG_VERSION=21 tsx 11ty/cp-cvs.ts",
+    "publish-w3c": "npm run changelog && WCAG_VERSION=22 WCAG_JSON=1 WCAG_MODE=publication npm run build && tsx 11ty/cp-cvs.ts",
+    "publish-w3c:21": "npm run changelog && WCAG_VERSION=21 WCAG_JSON=1 WCAG_MODE=publication npm run build && WCAG_VERSION=21 tsx 11ty/cp-cvs.ts",
     "start": "tsx watch node_modules/@11ty/eleventy/cmd.cjs --config=eleventy.config.ts --serve --incremental"
   },
   "author": "W3C",

From d3c5e4f68516ce51aa1b8f1b9637f767bbca3ac8 Mon Sep 17 00:00:00 2001
From: "Kenneth G. Franqueiro" <kfranqueiro@users.noreply.github.com>
Date: Tue, 2 Sep 2025 11:51:03 -0400
Subject: [PATCH 14/14] Update changelog data after 2025-08-25 SCR40 addition

---
 techniques/changelog.11tydata.json | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/techniques/changelog.11tydata.json b/techniques/changelog.11tydata.json
index 04d9fbf637..8c9e01774b 100644
--- a/techniques/changelog.11tydata.json
+++ b/techniques/changelog.11tydata.json
@@ -2,6 +2,14 @@
   "//": "DO NOT EDIT THIS FILE; it is automatically generated",
   "changelog": {
     "21": [
+      {
+        "date": "2025-08-25T20:11:16.000Z",
+        "hash": "6e22d07cb",
+        "techniques": [
+          "SCR40"
+        ],
+        "type": "added"
+      },
       {
         "date": "2025-06-20T14:07:03.000Z",
         "hash": "e94108df2",
@@ -499,6 +507,14 @@
       }
     ],
     "22": [
+      {
+        "date": "2025-08-25T20:11:16.000Z",
+        "hash": "6e22d07cb",
+        "techniques": [
+          "SCR40"
+        ],
+        "type": "added"
+      },
       {
         "date": "2025-06-20T14:07:03.000Z",
         "hash": "e94108df2",