diff --git a/api/MediaRecorder.json b/api/MediaRecorder.json
index 8cbbc093c5a0d4..de64b8e83a6236 100644
--- a/api/MediaRecorder.json
+++ b/api/MediaRecorder.json
@@ -116,6 +116,41 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "h26x_codecs": {
+            "__compat": {
+              "description": "`hvc1.*`, `hev1.*` and `avc3.*` codec strings in the `mimeType` option",
+              "tags": [
+                "web-features:mediastream-recording"
+              ],
+              "support": {
+                "chrome": {
+                  "version_added": "136",
+                  "notes": "Supported only when underlying OS support is available."
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": false
+                },
+                "firefox_android": "mirror",
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror",
+                "webview_ios": "mirror"
+              },
+              "status": {
+                "experimental": true,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         }
       },
@@ -307,6 +342,41 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "h26x_codecs": {
+          "__compat": {
+            "description": "`hvc1.*`, `hev1.*` and `avc3.*` codec strings in the `mimeType`",
+            "tags": [
+              "web-features:mediastream-recording"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "136",
+                "notes": "Supported only when underlying OS support is available."
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "firefox_android": "mirror",
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "mimeType": {