CSS2.1 UI colors Hightlight and HighlightText are both white. <div style="background-color: Highlight; color: HighlightText;">you can't see me</div>
Actually, unusable HighlightText is not an exception. Almost all CSS2.1 UI colors in WebKit are poorly chosen or invalid. Simple example: http://www.utoronto.ca/ian/books/xhtml1/appd/update-23feb2000.html
Bug 6129 tracks the general issue. *** This bug has been marked as a duplicate of 6129 ***