Created attachment 463019 [details] testcase Steps to reproduce: 1. open the attached testcase 2. try to drag the slider Expected result: The brightness of the image should change. Actual result: The brightness of the image doesn't change. I saw bug 99996, and this is probably similar to that, but that bug has been reported a decade ago, while this is a regression in Safari 16 (works as expected in Safari 15).
<rdar://problem/101232007>
Bisecting shows this was a regression from bug 232842.
Pull request: https://github.com/WebKit/WebKit/pull/5579
Committed 255869@main (4abefb791c76): <https://commits.webkit.org/255869@main> Reviewed commits have been landed. Closing PR #5579 and removing active labels.