864651 - Problem with position:fixed and overflow:hidden

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[davidef]

Attachment: position-fixed_and_overflow_hidden.htm

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130409194949

Steps to reproduce:

Create DIV (or SPAN) with stile position:fixed; overflow:hidden and inside second DIV (or SPAN) with position:fixed


Actual results:

Overflow _NOT_ function, second DIV (or SPAN) is _MOVED_ on top page


Expected results:

With position:relative or position:absolute is overflow:hidden and position OK

Comment 1

[davidef]

Attachment: Table with all combination of position for DIV and SPAN

Position fixed is totaly broken, bad any other combination is broken too.

Comment 2

[Boris Zbarsky [:bzbarsky]]

This worksforme as far as I can tell.  Reporter, can still reproduce?

Comment 3

[davidef]

Attachment: Basic example. Insider block with style FIXED is displaing on top window.

Comment 4

[davidef]

Attachment: Basic example after resize window. Insider block not moved, bot owerglow not hidden.

Comment 5

[davidef]

Attachment: In this table is all combinations. Many combinations is broken.

Comment 6

[davidef]

Attachment: And ther is table after resize window. Text not moved top, but owerflow...

Comment 7

[davidef]

Attachment: Firefox version: 23

Comment 8

[Boris Zbarsky [:bzbarsky]]

I'm not seeing the rendering you see in attachment 803654 [details] in a current trunk build (though I do see it in Firefox 23).

The rendering in attachment 803655 [details] looks correct to me: fixed-positioned boxes are kids of the viewport, so not affected by overflow styles on DOM ancestors.

Sounds like this got fixed sometime after 23.