RESOLVED FIXED 255914
REGRESSION (Safari 16.4): Dynamically set `<meter>` doesn't show the value 
https://bugs.webkit.org/show_bug.cgi?id=255914
Summary REGRESSION (Safari 16.4): Dynamically set `<meter>` doesn't show the value
Thomas Steiner
Reported 2023-04-25 01:33:15 PDT
Created attachment 466071 [details] Safari 1. Go to https://like-spiffy-pick.glitch.me/ on Safari Version 16.5 (18615.2.5.11.2) or Safari Technology Preview Release 168 (Safari 16.4, WebKit 18616.1.10.2) on macOS 13.4 Beta (22F5037d). 2. Notice how the first `<meter>`'s value isn't shown. 3. Try the same on Chrome, all three `<meter>`s' values are shown. The fix is to hide, then show the `<meter>`, or to populate the attributes statically, which may or may not be an option. This affects https://howfuguismybrowser.dev/.
Attachments
Safari (247.87 KB, image/png)
2023-04-25 01:33 PDT, Thomas Steiner 		no flags
Details
reduction (253 bytes, text/html)
2023-04-25 12:40 PDT, Aditya Keerthi 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Thomas Steiner
Comment 1 2023-04-25 01:34:21 PDT
In my tests, this seems to only affect desktop Safari, it works fine on iOS.
Thomas Steiner
Comment 2 2023-04-25 01:39:32 PDT
See the screenshot for details: https://bugs.webkit.org/attachment.cgi?id=466071.
Anne van Kesteren
Comment 3 2023-04-25 02:37:53 PDT
Aditya, can you take a look?
Radar WebKit Bug Importer
Comment 4 2023-04-25 02:38:07 PDT
<rdar://problem/108495001>
Aditya Keerthi
Comment 5 2023-04-25 11:00:48 PDT
I'm unable to reproduce on https://like-spiffy-pick.glitch.me/, but can reproduce on https://howfuguismybrowser.dev/.
Aditya Keerthi
Comment 6 2023-04-25 12:40:24 PDT
Created attachment 466080 [details] reduction Attaching a reliable reproduction.
Aditya Keerthi
Comment 7 2023-04-25 15:49:33 PDT
Confirmed this is a regression in Safari 16.4. This also reproduces with <progress>, and is fallout from GPU Process refactoring work. We need to ensure our `ControlPart` state is up-to-date, probably in `RenderBox::ensureControlPart`.
Aditya Keerthi
Comment 8 2023-04-26 17:33:18 PDT
Pull request: https://github.com/WebKit/WebKit/pull/13218
EWS
Comment 9 2023-04-27 16:57:42 PDT
Committed 263473@main (340e63b309b7): <https://commits.webkit.org/263473@main> Reviewed commits have been landed. Closing PR #13218 and removing active labels.
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