Simplify the _.support.dom check.

lodash.js

@@ -690,14 +690,6 @@
        */
       support.argsObject = arguments.constructor == Object && !(arguments instanceof Array);
 
-      /**
-       * Detect if the DOM is supported.
-       *
-       * @memberOf _.support
-       * @type boolean
-       */
-      support.dom = !!document && typeof document == 'object' && reNative.test(clearTimeout) && reNative.test(setTimeout);
-
       /**
        * Detect if `name` or `message` properties of `Error.prototype` are
        * enumerable by default. (IE < 9, Safari < 5.1)
@@ -790,6 +782,18 @@
        */
       support.unindexedChars = ('x'[0] + Object('x')[0]) != 'xx';
 
+      /**
+       * Detect if the DOM is supported.
+       *
+       * @memberOf _.support
+       * @type boolean
+       */
+      try {
+        support.dom = document.createDocumentFragment().nodeType === 11;
+      } catch(e) {
+        support.dom = false;
+      }
+
       /**
        * Detect if a DOM node's [[Class]] is resolvable (all but IE < 9)
        * and that the JS engine errors when attempting to coerce an object to