From 2ead272ee71875aac931eee0ac8aeff052a142fb Mon Sep 17 00:00:00 2001
From: MoyuScript <i@moyu.moe>
Date: Mon, 25 Nov 2013 09:48:12 -0500
Subject: [PATCH 1/2] Fix invalid selector exception with empty class values

After removing :before and :after pseudo selectors, a class name may be empty, causing an invalid selector string when joined. Remove empty elements before calling querySelectorAll.
---
 src/Parse.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Parse.js b/src/Parse.js
index 1bca773..583e245 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.
@@ -1273,4 +1276,4 @@ _html2canvas.Parse = function (images, options, cb) {
       }
     }
   }
-};
\ No newline at end of file
+};

From 2bf811b2e939af4c45906b7eed8c74cc5bbe08fd Mon Sep 17 00:00:00 2001
From: MoyuScript <i@moyu.moe>
Date: Mon, 25 Nov 2013 16:39:35 -0500
Subject: [PATCH 2/2] Update pseudoelements.html

---
 tests/cases/pseudoelements.html | 4 ++++
 1 file changed, 4 insertions(+)

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!";
       }