see https://wpt.fyi/results/html/rendering/dimension-attributes.html?label=master&label=experimental&aligned&q=dimension-attributes
Created attachment 449256 [details] Patch
Committed r288061 (246081@main): <https://commits.webkit.org/246081@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 449256 [details].
<rdar://problem/87640825>