The previous test was assuming non-quoted data: url... This solves (partially an issue raised by Pascua Theus)

Author: ylafon

org/w3c/css/values/CssURL.java

@@ -93,7 +93,7 @@ public void set(String s, ApplContext ac, URL base)
         if (!urlHeading.startsWith("url"))
             throw new InvalidParamException("url", s, ac);
         // special case for data url...
-        if (urlname.startsWith("data:")) {
+        if (urlname.contains("data:")) {
             // no more processing.
             value = checkDataURL(urlname);
             return;