289561 - When an element extends over an iframe, its hover and mouseover/mouseout are wrongly tracked

Status: VERIFIED FIXED

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Neil Mitchell]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6) Gecko/20050317 Firefox/1.0.2
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.6) Gecko/20050317 Firefox/1.0.2

When an element extends over an iframe, the hover and mouse events are wrongly
tracked. Specifically, if the hover is set when the mouse enters the iframe, it
will remain set until it leaves, even if the element only covers part of the iframe.

Reproducible: Always

Steps to Reproduce:
1. Load the attachment, which I'll post after I submit this bug
2. Move the mouse to the link, labeled "Outer Element"
3. Move the mouse vertically down, to the bottom of the Outer Element area
4. Move the mouse down below the Outer Element, into the iframe
5. Move the mouse down below the iframe
Actual Results:  
After step 3, the state is onmouseover, and the :hover style is applied (Outer
Element is yellow)
After step 4, the state is onmouseover, and the :hover style is applied (Outer
Element is yellow)
After step 5, the state is onmouseout, and the :hover style is not applied
(Outer Element is red)

Expected Results:  
After step 4, the state is should be in onmouseout, and the :hover style should
not be applied (Outer Element is red)

Also occurs on the latest Mozilla Nightly, Mozilla/5.0 (Windows; U; Windows NT
5.1; en-US; rv:1.8b2) Gecko/20050408, with its default configuration.

Comment 1

[Neil Mitchell]

Attachment: Testcase, as mentioned in the bug report

Comment 2

[Stephen Donner [:stephend] Not actively reading bugmail]

This isn't different from bug 289551, is it?

Comment 3

[Martijn Wargers (dead)]

This worked in trunk builds of a few days earlier. So probably the same issue as
bug 289539 and bug 289551.

Comment 4

[Gabriel Chadwick]

Probably a dupe but not sure. Confirming and wating for qa.

Comment 5

[Neil Mitchell]

I don't think this is a dupe of any of the 3 bugs that are linked to. They are
all about a hover for an element inside an iframe. This one relates elements
outside of an iframe, but which cover part of it - Outer Element is in the
parent frame, the iframe used is about:blank. I'm also not sure that its a
regression - looking at the testcases for all those three bugs in firefox 1.0.2
shows them working. This testcase does not work in FF1.0.2.

Comment 6

[Martijn Wargers (dead)]

Neil, that's correct. It doesn't work in Firefox1.0.2/Mozilla1.7.x , but this
was an issue that was already fixed in the 1.8b trunk builds. But since a few
days, it has become broken again in those builds for probably a different reason.

Comment 7

[Boris Zbarsky [:bzbarsky]]

The patch in bug 289719 fixes this.

Comment 8

[Boris Zbarsky [:bzbarsky]]

Fixed by checkin for bug 289719