Are you talking about customizing scroll bars by changing their colour? And when you validated, was it with an external css file? And if so, did you validate the css?
To my knowledge, customized scroll bars arent supported by xhtml, but are also only supported by IE & not other browsers.
My reckoning would be that the XHTML doctype didnt display the customization, whereas the HTML would. But if you had the formatting in a separate css file, then the XHTML page would still validate, even though it wouldnt show the scroll bar.
Have you checked it in other browssers apart from IE? There are many customisations that arent supported from browser to browser,or from HTML to XHTML, hence why there are so many hacks in place to deal with them. The reasoning behind XHTML was to try & make code compatable with all current & future technologies.
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