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CSS background images URLs don't seem to be unescaped by the test properly. This causes URLs like... background:url(/Test%20\(Test\)/test.jpg); ...where the parenthesis in the URL are backslash escaped to be tested as... http://<site.com>/Test%20%5c(Test%5c)/test.jpg ...instead of... http://site.com/Test%20(Test)/test.jpg ...and results in invalid errors.