From b01cac954e98f643c7ec89b7823e4690b1f6dbc8 Mon Sep 17 00:00:00 2001
From: Yang Pan <yangp2@andrew.cmu.edu>
Date: Sun, 8 Dec 2024 02:46:46 -0500
Subject: [PATCH 1/6] test: add sample for unquoted attributes

---
 .../samples/attribute-unquoted/input.svelte   |  3 +-
 .../samples/attribute-unquoted/output.json    | 41 ++++++++++++++++++-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte
index 4bab0df72f3e..959042384e69 100644
--- a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte
+++ b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte
@@ -1 +1,2 @@
-<div class=foo></div>
\ No newline at end of file
+<div class=foo></div>
+<a href=/>home</a>
\ No newline at end of file
diff --git a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json
index 5df4d66ab668..c73f4d5c4d6a 100644
--- a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json
+++ b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json
@@ -2,7 +2,7 @@
 	"html": {
 		"type": "Fragment",
 		"start": 0,
-		"end": 21,
+		"end": 40,
 		"children": [
 			{
 				"type": "Element",
@@ -27,6 +27,45 @@
 					}
 				],
 				"children": []
+			},
+			{
+				"type": "Text",
+				"start": 21,
+				"end": 22,
+				"raw": "\n",
+				"data": "\n"
+			},
+			{
+				"type": "Element",
+				"start": 22,
+				"end": 40,
+				"name": "a",
+				"attributes": [
+					{
+						"type": "Attribute",
+						"start": 25,
+						"end": 31,
+						"name": "href",
+						"value": [
+							{
+								"start": 30,
+								"end": 31,
+								"type": "Text",
+								"raw": "/",
+								"data": "/"
+							}
+						]
+					}
+				],
+				"children": [
+					{
+						"type": "Text",
+						"start": 32,
+						"end": 36,
+						"raw": "home",
+						"data": "home"
+					}
+				]
 			}
 		]
 	}

From 2ff87421e5d595ce88971b328455f4293dd4b9f3 Mon Sep 17 00:00:00 2001
From: Yang Pan <yangp2@andrew.cmu.edu>
Date: Sun, 8 Dec 2024 02:49:05 -0500
Subject: [PATCH 2/6] fix: handle unquoted slash in attributes

---
 .../compiler/phases/1-parse/state/element.js  | 20 +++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/packages/svelte/src/compiler/phases/1-parse/state/element.js b/packages/svelte/src/compiler/phases/1-parse/state/element.js
index 45350bb1aec5..2106caf9dc90 100644
--- a/packages/svelte/src/compiler/phases/1-parse/state/element.js
+++ b/packages/svelte/src/compiler/phases/1-parse/state/element.js
@@ -504,8 +504,24 @@ function read_attribute(parser) {
 	let value = true;
 	if (parser.eat('=')) {
 		parser.allow_whitespace();
-		value = read_attribute_value(parser);
-		end = parser.index;
+
+		if (parser.template[parser.index] === '/') {
+			const char_start = parser.index;
+			parser.index++; // consume '/'
+			value = [
+				{
+					start: char_start,
+					end: char_start + 1,
+					type: 'Text',
+					raw: '/',
+					data: '/'
+				}
+			];
+			end = parser.index;
+		} else {
+			value = read_attribute_value(parser);
+			end = parser.index;
+		}
 	} else if (parser.match_regex(regex_starts_with_quote_characters)) {
 		e.expected_token(parser.index, '=');
 	}

From 8941b77e700fd63de1f48d3fa103627638df1006 Mon Sep 17 00:00:00 2001
From: Yang Pan <yangp2@andrew.cmu.edu>
Date: Sun, 8 Dec 2024 03:00:09 -0500
Subject: [PATCH 3/6] docs: allow unquoted slash in attributes

---
 .changeset/long-boxes-flow.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/long-boxes-flow.md

diff --git a/.changeset/long-boxes-flow.md b/.changeset/long-boxes-flow.md
new file mode 100644
index 000000000000..b5b22a00e2f7
--- /dev/null
+++ b/.changeset/long-boxes-flow.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+Allow unquoted slash in attributes

From 863232e56227c239af46f2d42b56234ca5a2394a Mon Sep 17 00:00:00 2001
From: Yang Pan <yangp2@andrew.cmu.edu>
Date: Thu, 12 Dec 2024 16:53:59 +0900
Subject: [PATCH 4/6] test: add additional sample for unquoted href attributes

---
 .../samples/attribute-unquoted/input.svelte   |  3 +-
 .../samples/attribute-unquoted/output.json    | 41 ++++++++++++++++++-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte
index 959042384e69..527d6eebf104 100644
--- a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte
+++ b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/input.svelte
@@ -1,2 +1,3 @@
 <div class=foo></div>
-<a href=/>home</a>
\ No newline at end of file
+<a href=/>home</a>
+<a href=/foo>home</a>
\ No newline at end of file
diff --git a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json
index c73f4d5c4d6a..ab2912a2c019 100644
--- a/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json
+++ b/packages/svelte/tests/parser-legacy/samples/attribute-unquoted/output.json
@@ -2,7 +2,7 @@
 	"html": {
 		"type": "Fragment",
 		"start": 0,
-		"end": 40,
+		"end": 62,
 		"children": [
 			{
 				"type": "Element",
@@ -66,6 +66,45 @@
 						"data": "home"
 					}
 				]
+			},
+			{
+				"type": "Text",
+				"start": 40,
+				"end": 41,
+				"raw": "\n",
+				"data": "\n"
+			},
+			{
+				"type": "Element",
+				"start": 41,
+				"end": 62,
+				"name": "a",
+				"attributes": [
+					{
+						"type": "Attribute",
+						"start": 44,
+						"end": 53,
+						"name": "href",
+						"value": [
+							{
+								"start": 49,
+								"end": 53,
+								"type": "Text",
+								"raw": "/foo",
+								"data": "/foo"
+							}
+						]
+					}
+				],
+				"children": [
+					{
+						"type": "Text",
+						"start": 54,
+						"end": 58,
+						"raw": "home",
+						"data": "home"
+					}
+				]
 			}
 		]
 	}

From 3d990a02eff74bd9fc42c961e85604ab3793f732 Mon Sep 17 00:00:00 2001
From: Yang Pan <yangp2@andrew.cmu.edu>
Date: Thu, 12 Dec 2024 16:54:26 +0900
Subject: [PATCH 5/6] fix: improve handling of self-closing tags with unquoted
 attributes

---
 packages/svelte/src/compiler/phases/1-parse/state/element.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/svelte/src/compiler/phases/1-parse/state/element.js b/packages/svelte/src/compiler/phases/1-parse/state/element.js
index 2106caf9dc90..cd5cdd3e6e2c 100644
--- a/packages/svelte/src/compiler/phases/1-parse/state/element.js
+++ b/packages/svelte/src/compiler/phases/1-parse/state/element.js
@@ -505,7 +505,7 @@ function read_attribute(parser) {
 	if (parser.eat('=')) {
 		parser.allow_whitespace();
 
-		if (parser.template[parser.index] === '/') {
+		if (parser.template[parser.index] === '/' && parser.template[parser.index + 1] === '>') {
 			const char_start = parser.index;
 			parser.index++; // consume '/'
 			value = [

From ea9d4cfc9450b54f9495cfe3b58f9c693016031e Mon Sep 17 00:00:00 2001
From: Rich Harris <hello@rich-harris.dev>
Date: Thu, 12 Dec 2024 14:39:02 -0500
Subject: [PATCH 6/6] Update .changeset/long-boxes-flow.md

---
 .changeset/long-boxes-flow.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.changeset/long-boxes-flow.md b/.changeset/long-boxes-flow.md
index b5b22a00e2f7..d249354b6769 100644
--- a/.changeset/long-boxes-flow.md
+++ b/.changeset/long-boxes-flow.md
@@ -2,4 +2,4 @@
 'svelte': patch
 ---
 
-Allow unquoted slash in attributes
+fix: allow unquoted slash in attributes