diff --git a/core/modules/filter/filter.filter_html.admin.js b/core/modules/filter/filter.filter_html.admin.js
index 7ddca90bba..97caaa6d97 100644
--- a/core/modules/filter/filter.filter_html.admin.js
+++ b/core/modules/filter/filter.filter_html.admin.js
@@ -230,45 +230,40 @@
      *   tag name.
      */
     _parseSetting: function (setting) {
-      var node;
       var tag;
       var rule;
-      var attributes;
-      var attribute;
-      var allowedTags = setting.match(/(<[^>]+>)/g);
-      var sandbox = document.createElement('div');
       var rules = {};
-      for (var t = 0; t < allowedTags.length; t++) {
+
+      var parser = new CKEDITOR.htmlParser();
+      parser.onTagOpen = function( tagName, attributes, selfClosing ) {
         // Let the browser do the parsing work for us.
-        sandbox.innerHTML = allowedTags[t];
-        node = sandbox.firstChild;
-        tag = node.tagName.toLowerCase();
+        tag = tagName.toLowerCase();
 
         // Build the Drupal.FilterHtmlRule object.
         rule = new Drupal.FilterHTMLRule();
         // We create one rule per allowed tag, so always one tag.
         rule.restrictedTags.tags = [tag];
+
         // Add the attribute restrictions.
-        attributes = node.attributes;
-        for (var i = 0; i < attributes.length; i++) {
-          attribute = attributes.item(i);
-          var attributeName = attribute.nodeName;
+        Object.keys(attributes).forEach(function (nodeName) {
           // @todo Drupal.FilterHtmlRule does not allow for generic attribute
           //   value restrictions, only for the "class" and "style" attribute's
           //   values. The filter_html filter always disallows the "style"
           //   attribute, so we only need to support "class" attribute value
           //   restrictions. Fix once https://www.drupal.org/node/2567801 lands.
-          if (attributeName === 'class') {
-            var attributeValue = attribute.textContent;
+          if (nodeName === 'class') {
+            var attributeValue = attributes[nodeName];
             rule.restrictedTags.allowed.classes = attributeValue.split(' ');
           }
           else {
-            rule.restrictedTags.allowed.attributes.push(attributeName);
+            rule.restrictedTags.allowed.attributes.push(nodeName);
           }
-        }
+        });
 
         rules[tag] = rule;
-      }
+      };
+      parser.parse(setting);
+
       return rules;
     },