CSS specification says that computed values of font-stretch are percentages, not keywords.
https://drafts.csswg.org/css-fonts/#font-stretch-prop
<rdar://problem/101546363>
Pull request: https://github.com/WebKit/WebKit/pull/5760
Committed 256094@main (b724d37d49ca): <https://commits.webkit.org/256094@main> Reviewed commits have been landed. Closing PR #5760 and removing active labels.