Specs link: https://www.w3.org/TR/SVG2/paths.html#InterfaceSVGPathElement.
Related WPT test: https://wpt.fyi/results/svg/path/interfaces/SVGAnimatedPathData-removed.svg?label=master&label=experimental
<rdar://problem/114517026>
Pull request: https://github.com/WebKit/WebKit/pull/17112
Committed 267446@main (015533966bd7): <https://commits.webkit.org/267446@main> Reviewed commits have been landed. Closing PR #17112 and removing active labels.
I filed bug 260894 as follow-up.