Bug 82528

Summary:

Animation causes preceding positioned element to disappear in Safari on Snow Leopard

Product:

WebKit

Reporter:

Ingo Chao <info>

Component:

CSS

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED CONFIGURATION CHANGED

Severity:

Normal

CC:

ahmad.saleem792, davidbarr, dino, enne, graouts, karlcow, koivisto, simon.fraser, zalan

Priority:

Version:

528+ (Nightly build)

Hardware:

Mac (Intel)

OS:

OS X 10.6

Attachments:

Description	Flags
initial attachment	none

Ingo Chao

Reported 2012-03-28 14:14:43 PDT

Created attachment 134395 [details] initial attachment When an animated element does not overlap a preceding positioned element, and this positioned element has a positioned child, then the positioned element vanishes. See attachment.

Attachments
initial attachment (653 bytes, text/html) 2012-03-28 14:14 PDT, Ingo Chao	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Simon Fraser (smfr)

Comment 1 2012-03-28 17:13:34 PDT

Did this regress at some point?

Adrienne Walker

Comment 2 2012-03-28 17:20:05 PDT

(In reply to comment #1) > Did this regress at some point? As far as I can tell, this works in ToT Chrome. There's a green bar with "* Lorem", and a yellow bar that says "animation" animates to the right, causing the page to be composited.

Simon Fraser (smfr)

Comment 3 2012-03-28 18:20:10 PDT

I see "Lorem" blink, but that's because it's a tiled layer, since it has a child at some ridiculous offset. If this is just a blink, then it's a dup.

David Barr

Comment 4 2012-03-28 20:46:09 PDT

Reproduced with Safari Version 5.1.2 (6534.52.7) and the attachment. Also reproduced with WebKit Nightly (r112436). Could not reproduce with: Google Chrome: 19.0.1084.1 (Official Build 129459) canary OS: Mac OS X WebKit: 536.5 (@112426) Note, definitely using Skia not CoreGraphics. Nor with: Google Chrome: 17.0.963.83 (Official Build 127885) OS: Mac OS X WebKit: 535.11 (@111479) Possibly using CoreGraphics. Something specific to the Safari port, maybe?

Simon Fraser (smfr)

Comment 5 2012-03-28 21:18:15 PDT

David: you saw it blink, or disappear entirely and stay invisible?

David Barr

Comment 6 2012-03-28 21:21:14 PDT

To be clear, I saw the list disappear entirely and stay invisible.

Dean Jackson

Comment 7 2012-03-29 11:32:29 PDT

I couldn't reproduce in Safari with a nightly. What version of OS X were you using?

Dean Jackson

Comment 8 2012-03-29 11:32:48 PDT

(I do see the blink)

Ingo Chao

Comment 9 2012-03-29 11:37:07 PDT

Mac OS X Snow Leopard 10.6.1

Ahmad Saleem

Comment 10 2023-02-20 15:33:53 PST

I am not able to reproduce any magic of vanishing in this attached test on Safari 16.3 and it matches with Chrome Canary 112 and Firefox Nightly 112, which does not have any vanishing elements as well. Chrome do have text stuttering while animating though. Can someone else confirm and we can close this? Thanks!

Ahmad Saleem

Comment 11 2023-02-27 08:36:55 PST

Changing to "RESOLVED WONTFIX". CCing some from animation side to chip in, if they think it needs to be reopened but it is not reproducing for me.

Antoine Quint

Comment 12 2023-02-28 01:53:04 PST

Thanks for bringing this to my attention Ahmad. This looks fine to me, but I think configuration changed is a better resolution so I changed that.

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