The various implementations of instanceStartAnimation/instanceStopAnimation should be able to handle start/stop of multiple SVG animators.
Pull request: https://github.com/WebKit/WebKit/pull/1178
Committed r295054 (251149@main): <https://commits.webkit.org/251149@main> Reviewed commits have been landed. Closing PR #1178 and removing active labels.
<rdar://problem/94155342>