What does an underscore "_" mean in CSS? -

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i found following snippet in css file:

position: fixed; _position: absolute;

what underline mean in front of second position statement?

this old css-hack ie5, 5.5 & 6.
browser display position:fixed while ie5 - 6 use _position, display absolute.

but note: css won't validate! , won't work ie5/mac


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