See https://wpt.fyi/results/css/css-grid/parsing/grid-area-valid.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2021-grid
<rdar://problem/99778071>
https://wpt.fyi/results/css/css-grid/grid-layout-properties.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2021-grid
Pull request: https://github.com/WebKit/WebKit/pull/4743
Committed 254942@main (fbf76efc64df): <https://commits.webkit.org/254942@main> Reviewed commits have been landed. Closing PR #4743 and removing active labels.