One more annoying IE6 bug:

Assuming this CSS:

div { border: solid black 1px; }

And this HTML:

<div id="foo" style="background-color:lightgrey; border:solid red 1px">...</div>

When I evaluate $("foo").style.border=""; I expect to see a div with a light grey background and a black border. And lo, Mozilla doth fulfill my expectations, whereas the venerable IE nuketh not only the element-level style declaration, but also the entire cascade of styles applied heretofore, despite MS and IE having INVENTED Cascading Style Sheets.

Much as I sympathize with frustration at the W3C's glacial process of standards-making (in 'net years), it does seem as if people who don't pay attention to standards bodies end up producing products markably inferior to develop for than those who do.

Grr.