1106081 - Combination of opacity + preserve-3d + backface-visibility on child makes entire element disappear

Status: VERIFIED FIXED

(Core :: Web Painting, defect)

Description

[Sander]

Attachment: minimal testcase

Requesting tracking since this is a layout regression which hasn't shipped yet, and although it's in an experimental technology (backface-visibility), that's one which is used a lot for 3D-transforms in various web games ("flipping" effect), so has quite some potential to hit popular sites.

See the attached minimal testcase; this works in current stable (33.1.1) as well as Chromium (37.0.2062.120), but is broken in current beta (34.0) and aurora (35.0a2). I'll see about tracking down a regression range shortly.

Comment 1

[Sander]

This regressed between 20140808 and 20140909: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=18f408a5984e&tochange=83f519eb1a3a

From that range, bug 1042772 looks suspiciously likely. Timothy? (In which case, is this maybe a duplicate of bug 1098266..?)

Comment 2

[Lawrence Mandel [:lmandel] (use needinfo)]

34 is just about to ship (Monday). As such, I'm marking this as won't fix for 34. I have tracked 35+.

Comment 3

[Timothy Nikkel (:tnikkel)]

This is indeed fixed by the patch in bug 1098266, I just tested.

Comment 4

[Timothy Nikkel (:tnikkel)]

Bug 1098266 is fixed now, this should be fixed by that patch.

Comment 5

[[SV Manager] Florin Mezei, QA (:FlorinMezei)]

Reproduced the initial issue with the attached test case on Firefox 34.0.5. The issue no longer reproduces on Windows 7 x64, Mac OS X 10.9.5, Ubuntu 14.04 x64 with Firefox 35 Beta 6 (BuildID=20141222200458) and latest Firefox 36 Aurora (BuildID=20141223004006)