Manually apply the fix from facebook#4324 to version 0.13.3

Author: leolannenmaki

src/browser/ui/ReactMount.js

@@ -811,9 +811,29 @@ var ReactMount = {
           checksum
         );
 
-        var diffIndex = firstDifferenceIndex(markup, rootMarkup);
+        var normalizedMarkup = markup;
+        if (__DEV__) {
+          // because rootMarkup is retrieved from the DOM, various normalizations
+          // will have occurred which will not be present in `markup`. Here,
+          // insert markup into a <div> or <iframe> depending on the container
+          // type to perform the same normalizations before comparing.
+          var normalizer;
+          if (container.nodeType === ELEMENT_NODE_TYPE) {
+            normalizer = document.createElement('div');
+            normalizer.innerHTML = markup;
+            normalizedMarkup = normalizer.innerHTML;
+          } else {
+            normalizer = document.createElement('iframe');
+            document.body.appendChild(normalizer);
+            normalizer.contentDocument.write(markup);
+            normalizedMarkup = normalizer.contentDocument.documentElement.outerHTML;
+            document.body.removeChild(normalizer);
+          }
+        }
+
+        var diffIndex = firstDifferenceIndex(normalizedMarkup, rootMarkup);
         var difference = ' (client) ' +
-          markup.substring(diffIndex - 20, diffIndex + 20) +
+          normalizedMarkup.substring(diffIndex - 20, diffIndex + 20) +
           '\n (server) ' + rootMarkup.substring(diffIndex - 20, diffIndex + 20);
 
         invariant(