Right now the various marker properties disallow anything but a fragment identifier such as url(#foo). However, the spec only says that a URL should be provided.
Pull request: https://github.com/WebKit/WebKit/pull/10031
Committed 260299@main (adab1550880a): <https://commits.webkit.org/260299@main> Reviewed commits have been landed. Closing PR #10031 and removing active labels.
<rdar://problem/105483685>