I found the css border on the table cell is lost when applying css gradient filter at the same time. It seems that the gradient effect overrides the border.
Is it a
I've found a fix but you may not like it...
If you render in IE in quirks mode the border renders fine, it is only obscured if you're using compatibility mode. Compare these two pages in IE8:
With a DOCTYPE declaration
Without a DOCTYPE declaration
What also works is clicking the compatibility view button, but my attempts to get the same results with the compatibility mode meta tags were unsuccessful. I tried using box-sizing, but also with no success. I conclude the only way to get it to work as you want is to force IE into quirks mode, but that may create so many other issues for layout that you may be better off just adding a wrapper element to attach your gradient background to.