Bug 227705

Summary:

Missing or Flickering Elements

Product:

WebKit

Reporter:

Kerry <kerryliu>

Component:

Compositing

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED DUPLICATE

Severity:

Normal

CC:

simon.fraser, zalan

Priority:

Version:

Safari Technology Preview

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Test case for flickering text	none
Test reduction	none
smfr testcase	none

Kerry

Reported 2021-07-06 08:24:08 PDT

Created attachment 432933 [details] Test case for flickering text In the WordPress Block Editor, we were seeing elements flicker in Safari and the Safari Technology preview 127 in https://github.com/WordPress/gutenberg/issues/30803. I've narrowed this down to a test case, which I've attached. It's also available at https://codepen.io/gwwar/pen/dyWYdmg It should look like https://user-images.githubusercontent.com/1270189/124388676-c0a34f80-dc98-11eb-8987-aa0e6001c10c.mp4 with the bad behavior. It's a little bit of a complex setup, requiring flex styles, an iframe, two fixed divs, and some z-index stacking contexts. We're are able to consistently reproduce this, so I do feel it's worthwhile to report. Let us know if folks have trouble reproducing or if y'all need more information. Thanks!

Attachments
Test case for flickering text (5.26 KB, text/html) 2021-07-06 08:24 PDT, Kerry	no flags	Details
Test reduction (743 bytes, text/html) 2021-07-06 11:20 PDT, zalan	no flags	Details
smfr testcase (1.11 KB, text/html) 2021-07-06 12:31 PDT, Simon Fraser (smfr)	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Kerry

Comment 1 2021-07-06 08:35:42 PDT

If it helps, there's also a few other videos available at https://github.com/WordPress/gutenberg/pull/32824#issuecomment-873280550 Elements disappear or end up being ordered incorrectly when the iframe in .components-popover intersects with .block-editor-block-list__layout and causes a new compositing layer to be created.

zalan

Comment 2 2021-07-06 11:20:55 PDT

Created attachment 432947 [details] Test reduction

Simon Fraser (smfr)

Comment 3 2021-07-06 12:31:53 PDT

Created attachment 432961 [details] smfr testcase

Simon Fraser (smfr)

Comment 4 2021-07-06 14:39:42 PDT

Same as bug 220892, confirmed that the patch fixes it. *** This bug has been marked as a duplicate of bug 220892 ***

Kerry

Comment 5 2021-07-07 07:58:26 PDT

Great to know this already had a patch fix! Thanks for looking into it.

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