Certain combinations of CSS declarations break the Stylesheet utility. The style sheet from the test case is:

display: block;
}

height: 20px;
}

--- end ---

To reproduce the problem in Javascript, look at this line from the testcase below:

var sheet = YAHOO.util.StyleSheet(YAHOO.util.Dom.get('commonsheet'));

It produces an Object expected stylesheet-debug.js, line 195 character 17 in IE8. Problem happens with IE6 and IE8 (IE7 untested). The sample URL works well with Opera 9 anf Firefox 3.5 (always
on Windows).

If I remove the ", .someother" from the style sheet (i.e. having two style declarations for the same class), then both Opera and Firefox break too.