In this bug, we implement the two-value syntax of font-size-adjust specified in https://www.w3.org/TR/css-fonts-5/#font-size-adjust-prop.
Pull request: https://github.com/WebKit/WebKit/pull/11744
<rdar://problem/107290850>
Committed 262309@main (2f42bab72655): <https://commits.webkit.org/262309@main> Reviewed commits have been landed. Closing PR #11744 and removing active labels.