We have -webkit-mask-box-image which is similar.
<rdar://problem/82991599>
Pull request: https://github.com/WebKit/WebKit/pull/17217
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/41717
Committed 267460@main (ecf24fddc3cb): <https://commits.webkit.org/267460@main> Reviewed commits have been landed. Closing PR #17217 and removing active labels.