Which causes WI.CSSStyleDeclaration.prototype.enabledProperties to return out of date properties until they get invalidated by `update` method or `properties` setter.
Created attachment 365414 [details] Patch
Comment on attachment 365414 [details] Patch Clearing flags on attachment: 365414 Committed r243256: <https://trac.webkit.org/changeset/243256>
All reviewed patches have been landed. Closing bug.
<rdar://problem/49085283>