740382 - translate3d incorrect z translation placement

Status: RESOLVED DUPLICATE of bug 726766

(Core :: Layout, defect)

Description

[Jeremy Harris]

Attachment: z.html

User Agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.83 Safari/535.11

Steps to reproduce:

Using translate3d to move objects in 3d space can produce unexpected results on Firefox 11 for Windows. I was playing with translate3d, specifically using jmpress[1] and noticed some elements were upside down when viewing in Firefox.

A test case is attached and available on github[2]. You'll notice that in Firefox for Windows "Bar" appears on screen upside down, when it it outside what should be viewable. 

1: https://github.com/shama/jmpress.js/
2: https://gist.github.com/2032026


Actual results:

Elements outside of the viewer's viewable z-space were rendered upside down on the screen. It appears that if the z translation is set to something greater than the perspective + the parent's translate (the viewport), Firefox renders the item upside down at the negative z difference.


Expected results:

The elements should be outside of the viewing space and therefore should not appear.

This only appears to be an issue with Firefox for Windows. Webkit browsers and Firefox for Mac appear to render it correctly.

Comment 1

[Tim (fmdeveloper)]

Can you attach a screenshot of the issue?

Can you also test with the latest nightly? It may have been fixed already

Unable to reproduce on Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120329 Firefox/14.0a1 ID:20120329031156

Comment 2

[Jeremy Harris]

Attachment: screenshot

Comment 3

[Jeremy Harris]

Added screenshot. I also just tested on the latest nightly (14.0a1) and it rendered the same as Fx 11.

Comment 4

[Tim (fmdeveloper)]

Please post the contents of about:support as a text attachment to this bug

Comment 5

[Loic]

Attachment: bug740382-capture-ff14

I see something weird, the word "Bar" appears upside down only if I disable HWA in FF14 (Nightly). With HWA on, "Bar" stays invisible.

In addition, turning off HWA implies a kind of "translation/contraction" of the word "Foo" (see the red lines on the screenshot).

Comment 6

[Jeremy Harris]

Attachment: about:support from Nightly

No problem, I attached it from the nightly. Let me know if you need anything else!

Comment 7

[Nickolay_Ponomarev]

I can reproduce on Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120329 Firefox/14.0a1 (in Parallels).