Add release note for mdn#10415

ddbeck · May 20, 2021 · f269036 · f269036
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diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
@@ -29,6 +29,7 @@ May 20, 2021
 - The following non-existent, long-removed, or otherwise irrelevant features have been removed:
 
   - `api.TransitionEvent.animationName` ([#10336](https://github.com/mdn/browser-compat-data/pull/10336))
+  - `api.WindowClient.ancestorOrigins` ([#10415](https://github.com/mdn/browser-compat-data/pull/10415))
 
 ## [v3.3.3](https://github.com/mdn/browser-compat-data/releases/tag/v3.3.3)