[WSG] border doesn't work when -ms-filter (gradient) is used

[tee]

Is this an IE9 bug?

http://jsbin.com/acawat

First table has -ms-filter: "progid:DXImageTransform.Microsoft.gradient" for th 
and td, border lines are gone except the first (border-top for th) and the last 
{border-bottm for td).

Thanks!

tee

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