I first noticed the problem when I tried to use a PNG+alpha background in an element that contains an hyperlink (see test page). The hyperlink would not work in certain area, which I later identified as non transparent areas of the background image.
It seems as if the filter "steals" mouse events in non transparent areas, regardless of its z-order (no click, no cursor shape change).
Workaround: add the filter to an element with position: static, and there must be a position: relative child element.
Test page Workaround is not included
Reported by: Herve Masson.
Explorer 5-6 Windows, Explorer 7 | Reported on 26 March 2007.
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1 Posted by Chris McLay on 26 March 2007 | Permalink
I have also noticed that adding "background-image: url(/images/transparent.gif)" to the object with the transparent background is a workaround for this problem in some cases.