What steps will reproduce the problem?

use: selectors & pseudo classes

exp: E[foo^="bar"]:hover {background: red;}

What is the expected output? What do you see instead?

No respone.

What version of the product are you using? On what operating system?

I use ie7-2.1(beta4)-ie9.js

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Failed: div[foo = "bar"]:hover div[foo $= "bar"]:hover

OK: div[foo ~= "bar"]:hover div[foo |= "bar"]:hover div[foo ^= "bar"]:hover div[foo *= "bar"]:hover

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Bug Fixed!