Is this very naughty? It doesn't validate as CSS, but then neither does the underscore hack (unless the validator is wrong, as some would have us believe).
The easiest description is that _ or - as the first letter of a selector is formally allowed in CSS (it is designed for vendor specific extensions). It only doesn't validate because it is not present in CSS2.1 formal gramatic, however it is valid in the global CSS scope.
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