css being parsed by c5?

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I have a background definition that is not being applied when using c5:
background:url('images/footer_bullets.png') no-repeat 0px 0px;
If I remove the quotes it works (against w3schools recommendationshttp://www.w3schools.com/css/css_background.asp).... It seems that c5 dont like the quotes when it changes the path from relative to absolute.

When I use the =| selector in the css c5 don't like that either and dont let it through, this is really useful for partial-matches-in-dash-separated-attributes and a compliant css2 selector.
http://www.w3.org/TR/CSS2/selector.html#attribute-selectors...

It seems that these might be related, but how and what can I do about it?