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From http://www.w3.org/mid/4049fe68.650248878@smtp.bjoern.hoehrmann.de '' Hi, http://jigsaw.w3.org/css-validator/validator?text=x+%7B+background%3A+url%28a% 26b%29+%7D The pretty printed style sheet contains <span class='vPropertyValue'>url(a&b) repeat</span> which is improper markup. ''
This is a duplicate of another bug with the same testcase which is already fixed too