MathML CG decision: https://github.com/mathml-refresh/mathml/issues/7#issuecomment-472790625
There are more changes to MathML lengths: https://github.com/mathml-refresh/mathml/issues/63
Pull request: https://github.com/WebKit/WebKit/pull/5023
Committed 255818@main (f243e31b7e94): <https://commits.webkit.org/255818@main> Reviewed commits have been landed. Closing PR #5023 and removing active labels.
<rdar://problem/101416307>