Drag me
Drag me

On Firefox3/Win, the black DIV appears to obstruct the Flash SWF in the white DIV when you try to hover or click on the Flash SWF. The obstructed area appears to be any area on the white DIV overlapping an area of the black DIV except for the areas on the white DIV overlapping an area on the black DIV past the top-left offset of the white DIV. Bizarre!

This is illustrated in the example above. Any part of the white DIV not overlapping the black DIV is clickable. The area overlapping the black DIV surrounded by the red dashed border is also clickable.

I think this can best be explained by overflow auto/scroll creating some sort of chrome component, which somehow affects the mouse event region of Flash components. See: https://bugzilla.mozilla.org/show_bug.cgi?id=362193

Workarounds? Note: overflow: auto/scroll and wmode="transparent" are both required in my implementation.