Merge https://chromium.googlesource.com/chromium/blink/+/eb8786ea0e2d44020dcf251e8d7b23112c45900c It was removed from the spec awhile ago, and was never implemented beyond support for parsing the CSS property.
That fix was merged from WebKit to Blink, so we don't need to merge it back. *** This bug has been marked as a duplicate of bug 102105 ***