Internet Explorer fails to render backgrounds for elements that have both an ID and a class defined. For instance, #photos.background1 will display the corresponding background in IE6 for Windows, but once that has been defined, #photos.background2, #photos.background3, etc. will not be displayed.
Test page Workaround is included
Reported by: Nathan Smith.
Explorer 5-6 Windows | Reported on 16 September 2005.
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1 Posted by Christian Fecteau on 28 September 2005 | Permalink
The rule is honored by IE6 if defined in a different stylesheet:
http://www.christianfecteau.com/echo/ie6_id_class_bug/
This is a parsing bug related to a single stylesheet.