LegacyLineLayout supports it, just not IFC. css/css-text/text-align/text-align-last-006.html tests this upstream, but with no reference.
<rdar://problem/94384891>
Pull request: https://github.com/WebKit/WebKit/pull/1308
Committed r295265 (251311@main): <https://commits.webkit.org/251311@main> Reviewed commits have been landed. Closing PR #1308 and removing active labels.