452743 - Flash becomes non-interactive when overlapping an "overflow:auto" div

Status: RESOLVED INCOMPLETE

(Core Graveyard :: Plug-ins, defect)

Description

[Stefan Behninger]

User-Agent:       Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322)
Build Identifier: FF 3.0.1 / Minefield 3.1pre2 20080828034823

When a Flash plugin with "wmode" set to "opaque" or "transparent" instead of the default of "window" overlaps a div that has "overflow" set to "auto", the Flash plugin becomes non-interactive in FF3/Windows. I.e. mouse movements, hovers or clicks are not handled by the plugin.

Reproducible: Always

Steps to Reproduce:
1. Create a div with "overflow:auto" and a Flash object with "wmode:opaque" or "wmode:transparent", position the Flash so that it overlaps the scrollable div (test case attached).
2. Move the mouse over the Flash object.
Actual Results:  
If the Flash movie contains any interactive elements like a button, these elements will not react to your mouse actions when the mouse is inside the area where the plugin overlaps with the div.
Also, if you right-click in that area, the Flash player's context-menu pops up in the wrong place.

Expected Results:  
In the attached example, there is a button that should become a lighter shade of gray when the mouse is over it and the cursor should change to hand. The player's context menu should pop up exactly under the cursor when right-clicking on the Flash movie.

This bug does only occur with the FF3 branch under Windows. Tested with Windows XP and MacOs X 10.4.

Comment 1

[Stefan Behninger]

Attachment: Test case

Comment 2

[Stefan Behninger]

This bug might or might not be related to bugs [448567] or [446472]

Comment 3

[Benjamin Smedberg]

Resolving old bugs which are likely not relevant any more, since NPAPI plugins are deprecated.