The interface of SVGElement is defined here: https://www.w3.org/TR/SVG2/types.html#InterfaceSVGElement. Related WPT tests: https://wpt.fyi/results/svg/historical.html?label=experimental&label=master&aligned.
Created attachment 381634 [details] Patch
Created attachment 381640 [details] Patch
Created attachment 381663 [details] Patch
The commit-queue encountered the following flaky tests while processing attachment 381663 [details]: fetch/fetch-worker-crash.html bug 187257 (author: youennf@gmail.com) The commit-queue is continuing to process your patch.
Comment on attachment 381663 [details] Patch Clearing flags on attachment: 381663 Committed r251499: <https://trac.webkit.org/changeset/251499>
All reviewed patches have been landed. Closing bug.
<rdar://problem/56554246>