diff --git a/src/Parse.js b/src/Parse.js
index 123fb7e..4b6b476 100644
--- a/src/Parse.js
+++ b/src/Parse.js
@@ -77,6 +77,9 @@ _html2canvas.Parse = function (images, options, cb) {
       for (i = 0, j = classes.length; i < j; i++) {
         classes[i] = classes[i].match(/(^[^:]*)/)[1];
       }
+      
+      // remove empty values, if not could cause invalid selectors with querySelectorAll
+      classes = classes.filter(function (n) { return n });
     }
 
     // Using the list of elements we know how pseudo el styles, create fake pseudo elements.
@@ -1270,4 +1273,4 @@ _html2canvas.Parse = function (images, options, cb) {
       }
     }
   }
-};
\ No newline at end of file
+};
diff --git a/tests/cases/pseudoelements.html b/tests/cases/pseudoelements.html
index ae08815..1d415eb 100644
--- a/tests/cases/pseudoelements.html
+++ b/tests/cases/pseudoelements.html
@@ -5,6 +5,10 @@
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <script type="text/javascript" src="../test.js"></script>
     <style>
+      :root .text *::before {
+        content:" root before!"; 
+      }
+      
       .text *::before {
         content:" before!";
       }