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diff --git a/testing/web-platform/tests/dom/nodes/append-on-Document.html b/testing/web-platform/tests/dom/nodes/append-on-Document.html
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+++ b/testing/web-platform/tests/dom/nodes/append-on-Document.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>DocumentType.append</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-parentnode-append">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+
+function test_append_on_Document() {
+
+ var node = document.implementation.createDocument(null, null);
+ test(function() {
+ var parent = node.cloneNode();
+ parent.append();
+ assert_array_equals(parent.childNodes, []);
+ }, 'Document.append() without any argument, on a Document having no child.');
+
+ test(function() {
+ var parent = node.cloneNode();
+ var x = document.createElement('x');
+ parent.append(x);
+ assert_array_equals(parent.childNodes, [x]);
+ }, 'Document.append() 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.append(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.append('text'); });
+ assert_array_equals(parent.childNodes, []);
+ }, 'Document.append() 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.append(x, y); });
+ assert_array_equals(parent.childNodes, []);
+ }, 'Document.append() with two elements as the argument, on a Document having no child.');
+
+}
+
+test_append_on_Document();
+
+</script>
+</html>