See https://www.w3schools.com/cssref/tryit.php?filename=trycss3_border-image
Pull request: https://github.com/WebKit/WebKit/pull/26509
Committed 277373@main (619a9da57af1): <https://commits.webkit.org/277373@main> Reviewed commits have been landed. Closing PR #26509 and removing active labels.