<!DOCTYPE html> <meta charset=utf-8> <title>DocumentType.prepend</title> <link rel=help href="https://dom.spec.whatwg.org/#dom-parentnode-prepend"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script> function test_prepend_on_Document() { var node = document.implementation.createDocument(null, null); test(function() { var parent = node.cloneNode(); parent.prepend(); assert_array_equals(parent.childNodes, []); }, 'Document.prepend() without any argument, on a Document having no child.'); test(function() { var parent = node.cloneNode(); var x = document.createElement('x'); parent.prepend(x); assert_array_equals(parent.childNodes, [x]); }, 'Document.prepend() with only one element as an argument, on a Document having no child.'); test(function() { var parent = node.cloneNode(); var x = document.createElement('x'); var y = document.createElement('y'); parent.appendChild(x); assert_throws_dom('HierarchyRequestError', function() { parent.prepend(y); }); assert_array_equals(parent.childNodes, [x]); }, 'Document.append() with only one element as an argument, on a Document having one child.'); test(function() { var parent = node.cloneNode(); assert_throws_dom('HierarchyRequestError', function() { parent.prepend('text'); }); assert_array_equals(parent.childNodes, []); }, 'Document.prepend() with text as an argument, on a Document having no child.'); test(function() { var parent = node.cloneNode(); var x = document.createElement('x'); var y = document.createElement('y'); assert_throws_dom('HierarchyRequestError', function() { parent.prepend(x, y); }); assert_array_equals(parent.childNodes, []); }, 'Document.prepend() with two elements as the argument, on a Document having no child.'); } test_prepend_on_Document(); </script> </html>