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Automatic update from web-platform-tests Properly clone and reattach @keyframes rules The rules not being properly deep-cloned as CSSOM wrappers reattached lead to modifications being applied to multiple stylesheets initially sharing a StyleSheetContents instance. Bug: 514449396 Change-Id: Ia78191430974e6263ad3afca19d9a0d2a39f170b Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7865248 Commit-Queue: Rune Lillesveen <[email protected]> Reviewed-by: Kevin Babbitt <[email protected]> Cr-Commit-Position: refs/heads/main@{#1634779} -- wpt-commits: b2be13960680942e71fbf2a4f16b0695885b3af1 wpt-pr: 60089