src/third_party/web_platform_tests/dom/interface-objects.html - cobalt - Git at Google

 <!DOCTYPE html>
 <title>Interfaces</title>
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 <div id="log"></div>
 <script>
 function testInterfaceDeletable(iface) {
   test(function() {
     assert_true(!!window[iface], "Interface should exist.")
     assert_true(delete window[iface], "The delete operator should return true.")
     assert_equals(window[iface], undefined, "Interface should be gone.")
   }, "Should be able to delete " + iface + ".")
 }
 var interfaces = [
   "Event",
   "CustomEvent",
   "EventTarget",
   "Node",
   "Document",
   "DOMImplementation",
   "DocumentFragment",
   "ProcessingInstruction",
   "DocumentType",
   "Element",
   "Attr",
   "CharacterData",
   "Text",
   "Comment",
   "NodeIterator",
   "TreeWalker",
   "NodeFilter",
   "NodeList",
   "HTMLCollection",
   "DOMStringList",
   "DOMTokenList",
   "DOMSettableTokenList"
 ];
 test(function() {
   for (var p in window) {
     interfaces.forEach(function(i) {
       assert_not_equals(p, i)
     })
   }
 }, "Interface objects properties should not be Enumerable")
 interfaces.forEach(testInterfaceDeletable);
 </script>
	<!DOCTYPE html>
	<title>Interfaces</title>
	<script src="/resources/testharness.js"></script>
	<script src="/resources/testharnessreport.js"></script>
	<div id="log"></div>
	<script>
	function testInterfaceDeletable(iface) {
	test(function() {
	assert_true(!!window[iface], "Interface should exist.")
	assert_true(delete window[iface], "The delete operator should return true.")
	assert_equals(window[iface], undefined, "Interface should be gone.")
	}, "Should be able to delete " + iface + ".")
	}
	var interfaces = [
	"Event",
	"CustomEvent",
	"EventTarget",
	"Node",
	"Document",
	"DOMImplementation",
	"DocumentFragment",
	"ProcessingInstruction",
	"DocumentType",
	"Element",
	"Attr",
	"CharacterData",
	"Text",
	"Comment",
	"NodeIterator",
	"TreeWalker",
	"NodeFilter",
	"NodeList",
	"HTMLCollection",
	"DOMStringList",
	"DOMTokenList",
	"DOMSettableTokenList"
	];
	test(function() {
	for (var p in window) {
	interfaces.forEach(function(i) {
	assert_not_equals(p, i)
	})
	}
	}, "Interface objects properties should not be Enumerable")
	interfaces.forEach(testInterfaceDeletable);
	</script>