349375 - <object> or <iframe> nested in <marquee> causes screen to flick/shake

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[Daniel Wang]

<marquee><iframe></iframe></marquee> causes the portion of the layout to shake.

Comment 1

[Daniel Wang]

Attachment: reduced testcase

Comment 2

[Wilson Lee [:kourge]]

This problems seems not to be limited to <marquee> elements, but all block level elements.

I have been using a JavaScript library called window.js (http://prototype-window.xilinus.com/), and from its usage, it seems that <div> elements tear and shake when an <iframe> is moving on top of it.

That's why I suspect this applies to all block level elements. (<marquee> is implemented as a block level too, is it? Saw that in html.css.)

Comment 3

[Wilson Lee [:kourge]]

(In reply to comment #2)
> That's why I suspect this applies to all block level elements. (<marquee> is
> implemented as a block level too, is it? Saw that in html.css.)

Ugh. I mean, as a block level *element*.

Comment 4

[j.j.]

Attachment: more simple testcase

I see this with
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a2pre) Gecko/20070204 Minefield/3.0a2pre

Comment 5

[j.j.]

Hmm, Martijn, a simple marquee { overflow: auto } in html.css seems to fix this.

(Adding overflow:auto style to <marquee> is a workaround for this bug, at least for this testcases here)

Comment 6

[Zack Weinberg (:zwol)]

The "compositor phase 1" patches (https://build.mozilla.org/tryserver-builds/[e-mail]-try-f9bf8fa4178/) seem to have addressed this bug.

Comment 7

[j.j.]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090722 Minefield/3.6a1pre

Works fine now.

Comment 8

[j.j.]

Fixed by bug 352093.