Due to a mistake, the SVG2 rule of assigning a new stacking context to outermost <svg> elements is not enabled, fix that. It's especially important when transformations are assigned to such elements -- they won't affect the descendants, if the element does not establish a stacking context.
Pull request: https://github.com/WebKit/WebKit/pull/4157
Committed 254314@main (a57723e63710): <https://commits.webkit.org/254314@main> Reviewed commits have been landed. Closing PR #4157 and removing active labels.
<rdar://problem/99752552>