The codepen in this blog post https://nerdy.dev/steal-this-popover-starter-kit (https://codepen.io/argyleink/pen/JjzqXee) has a bug on STP 190 where the "tip" contents of the popover is missing when you open the popover for a 2nd time. This is probably related to `@starting-style`, since I can't reproduce this bug in Safari 17.4 and that does not support `@starting-style`.
<rdar://problem/125085007>
Pull request: https://github.com/WebKit/WebKit/pull/26308
Committed 276546@main (353c94ffa3f7): <https://commits.webkit.org/276546@main> Reviewed commits have been landed. Closing PR #26308 and removing active labels.
Thanks for filing and for the good test case