This tests that Comment is constructable. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS new Comment("one").data is "one" PASS new Comment().data is "" PASS new Comment("two").ownerDocument is document PASS typeof new Comment is "object" PASS Object.prototype.toString.call(new Comment) is "[object Comment]" PASS new Comment instanceof Comment is true PASS Object.getPrototypeOf(new Comment) is Comment.prototype PASS new innerWindow.Comment("three").ownerDocument is innerDocument PASS new innerWindow.Comment instanceof innerWindow.Comment is true PASS Object.getPrototypeOf(new innerWindow.Comment) is innerWindow.Comment.prototype PASS successfullyParsed is true TEST COMPLETE