--- Comment #9 from Erwin Dokter <er...@darcoury.nl> ---
Found more issues with the filter when working on the tabs in bug 61099.
The Vector tabs are constructed using background images only. One of them is
the tab-break, which is 1px wide. This is easy to simulate with linear
gradients using the background-size CSS property. The MS filter does not
respect that however.
If the filter is included, the tab-break will always flood the entire tab,
giving it the wrong color. Also, the filter does not accept 'transarent', which
is essential for rendering the tab-break using linear-gradient.
In short: including the filter makes it impossible to render the tabs in IE.
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