Windowed and Windowless Elements

One thing to watch out for as a Web Developer is windowed elements. Even if the website you create looks as though it works perfectly fine in older browsers, you may have missed checking the placement of windowed elements.

What are windowed elements?
In versions 6 and below of Internet Explorer, some of the HTML components used are ‘borrowed’ from standard windows components, and as a result they are drawn differently. Microsoft decided to call these elements ‘windowed’ elements, which a cynic would say hides a bug as a ‘feature’. Happily, Internet Explorer 7 onwards does not contain any windowed elements.