See failing subtest at: https://wpt.fyi/results/css/css-properties-values-api/register-property-syntax-parsing.html?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned&view=interop&q=label%3Ainterop-2023-property
<rdar://problem/114235642>
Pull request: https://github.com/WebKit/WebKit/pull/16918
Committed 267134@main (d72a71047daa): <https://commits.webkit.org/267134@main> Reviewed commits have been landed. Closing PR #16918 and removing active labels.