diff --git a/html/global_attributes.json b/html/global_attributes.json
index 57bd8fa1128dd1..27c1bc8a00c176 100644
--- a/html/global_attributes.json
+++ b/html/global_attributes.json
@@ -1001,12 +1001,14 @@
             ],
             "support": {
               "chrome": {
-                "version_added": "133"
+                "version_added": "133",
+                "notes": "Implements an older version of the specification with inconsistent behaviors. See [bug 499019927](https://crbug.com/499019927)."
               },
               "chrome_android": "mirror",
               "edge": "mirror",
               "firefox": {
-                "version_added": "149"
+                "version_added": "149",
+                "notes": "Implements an older version of the specification with inconsistent behaviors. See [bug 2029974](https://bugzil.la/2029974)."
               },
               "firefox_android": "mirror",
               "oculus": "mirror",