SVG renderer updates are currently tracked as a kind of Style::Update change. When a page is updating attributes on many SVG elements, but is not making changes that require a restyle on those elements, we can spend a lot of time hashing to store and look up the Style::Update associated with an element.
We could track the "SVG renderer update is needed" state using a Node flag instead, but continue using the Style::Update mechanism for root tracking, to reduce the overhead.
Pull request: https://github.com/WebKit/WebKit/pull/1430
Pull request: https://github.com/WebKit/WebKit/pull/1492
Pull request: https://github.com/WebKit/WebKit/pull/1493
Committed r295539 (251544@main): <https://commits.webkit.org/251544@main>
Reviewed commits have been landed. Closing PR #1430 and removing active labels.