Import dom/ from web-platform-tests

third_party/WebKit/LayoutTests/imported/web-platform-tests/dom/nodes/Document-createComment-createTextNode.js

+function test_create(method, iface, nodeType, nodeName) {
+  ["\u000b", "a -- b", "a-", "-b", null, undefined].forEach(function(value) {
+    test(function() {
+      var c = document[method](value);
+      var expected = String(value);
+      assert_true(c instanceof iface);
+      assert_true(c instanceof CharacterData);
+      assert_true(c instanceof Node);
+      assert_equals(c.ownerDocument, document);
+      assert_equals(c.data, expected, "data");
+      assert_equals(c.nodeValue, expected, "nodeValue");
+      assert_equals(c.textContent, expected, "textContent");
+      assert_equals(c.length, expected.length);
+      assert_equals(c.nodeType, nodeType);
+      assert_equals(c.nodeName, nodeName);
+      assert_equals(c.hasChildNodes(), false);
+      assert_equals(c.childNodes.length, 0);
+      assert_equals(c.firstChild, null);
+      assert_equals(c.lastChild, null);
+    }, method + "(" + format_value(value) + ")");
+  });
+}