<!DOCTYPE html> <html class=foo> <meta charset=utf-8> <title>getElementsByClassName across documents</title> <link rel=help href="https://dom.spec.whatwg.org/#dom-document-getelementsbyclassname"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <div id=log></div> <script class=foo> async_test(function() { var iframe = document.createElement("iframe"); iframe.onload = this.step_func_done(function() { var collection = iframe.contentDocument.getElementsByClassName("foo"); assert_equals(collection.length, 3); assert_equals(collection[0].localName, "html"); assert_equals(collection[1].localName, "head"); assert_equals(collection[2].localName, "body"); }); iframe.src = "getElementsByClassNameFrame.htm"; document.body.appendChild(iframe); }); </script>