Bug 41701 – Parts of page disappear

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[Nathan Lawrence]

Steps to reproduce:

1) Visit http://inhabitat.com/2010/06/29/university-of-michigan-solar-car-team-wins-american-solar-challenge/
2) Scroll down below the header of the page
3) Let the page sit for a few minutes
4) Scroll back up, the header is gone.

[Alexey Proskuryakov]

I cannot reproduce this with Safari 5.0 on Snow Leopard.

Could you please describe your configuration (OS, Safari and Flash versions, 64 bit or 32 bit)? Is this reliably reproducible? Does this happen with Flash disabled?

[Nathan Lawrence]

After investigating further, this problem seems to involve plugins.  It is unnecessary to scroll down on the page to cause the header to disappear.  Disabling plugins seems to cause the problem to go away.  After the header has disappeared, if you turn plugins off, the header will reappear, and then disappear when plugins are turned back on.

I'm running 64bit Safari 5.0 on Snow Leopard.  It seems to alternate between the entire header disappearing, and just the logo in the upper left disappearing.  I have also confirmed that the problem exists on the r62241 nightly build for Snow Leopard.

[Nathan Lawrence]

The version of flash that I am running (http://kb2.adobe.com/cps/155/tn_15507.html) is 10,1,53,64.

[Simon Fraser (smfr)]

<rdar://problem/8163389>

[Simon Fraser (smfr)]

Does this happen with TOT?

[Nathan Lawrence]

Running on a debug build of revision 62596 (2010-07-06 14:21:37), the problem still seems to occur.

[Simon Fraser (smfr)]

Created attachment 76601 [details]
Patch

[Chris Marrin]

Comment on attachment 76601 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=76601&action=review

> LayoutTests/compositing/geometry/limit-layer-bounds-opacity-transition.html:64
> +</html>

Since this test involves video (and it looks like a plugin is required to tickle the bug), shouldn't it have plugin or video in the name?

> WebCore/rendering/RenderLayerBacking.cpp:1156
> +    return didAnimateTransform || didAnimateOpacity;

Yeah, much better logic

[Simon Fraser (smfr)]

http://trac.webkit.org/changeset/74085