We need to connect the font-variant-alternates CSS value with the mapping information contained inside the at-rule @font-feature-values, and pass the correct integer flag to the platform code. Depends on: https://bugs.webkit.org/show_bug.cgi?id=246120
<rdar://problem/100830615>
Pull request: https://github.com/WebKit/WebKit/pull/5603
Committed 256002@main (a14a556da51f): <https://commits.webkit.org/256002@main> Reviewed commits have been landed. Closing PR #5603 and removing active labels.