1 files changed, 67 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/nodes/ParentNode-append.html b/testing/web-platform/tests/dom/nodes/ParentNode-append.html
new file mode 100644
index 0000000000..4e101f73a2
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/ParentNode-append.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>ParentNode.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 src="pre-insertion-validation-hierarchy.js"></script>
+<script>
+preInsertionValidateHierarchy("append");
+
+function test_append(node, nodeName) {
+    test(function() {
+        const parent = node.cloneNode();
+        parent.append();
+        assert_array_equals(parent.childNodes, []);
+    }, nodeName + '.append() without any argument, on a parent having no child.');
+
+    test(function() {
+        const parent = node.cloneNode();
+        parent.append(null);
+        assert_equals(parent.childNodes[0].textContent, 'null');
+    }, nodeName + '.append() with null as an argument, on a parent having no child.');
+
+    test(function() {
+        const parent = node.cloneNode();
+        parent.append(undefined);
+        assert_equals(parent.childNodes[0].textContent, 'undefined');
+    }, nodeName + '.append() with undefined as an argument, on a parent having no child.');
+
+    test(function() {
+        const parent = node.cloneNode();
+        parent.append('text');
+        assert_equals(parent.childNodes[0].textContent, 'text');
+    }, nodeName + '.append() with only text as an argument, on a parent having no child.');
+
+    test(function() {
+        const parent = node.cloneNode();
+        const x = document.createElement('x');
+        parent.append(x);
+        assert_array_equals(parent.childNodes, [x]);
+    }, nodeName + '.append() with only one element as an argument, on a parent having no child.');
+
+    test(function() {
+        const parent = node.cloneNode();
+        const child = document.createElement('test');
+        parent.appendChild(child);
+        parent.append(null);
+        assert_equals(parent.childNodes[0], child);
+        assert_equals(parent.childNodes[1].textContent, 'null');
+    }, nodeName + '.append() with null as an argument, on a parent having a child.');
+
+    test(function() {
+        const parent = node.cloneNode();
+        const x = document.createElement('x');
+        const child = document.createElement('test');
+        parent.appendChild(child);
+        parent.append(x, 'text');
+        assert_equals(parent.childNodes[0], child);
+        assert_equals(parent.childNodes[1], x);
+        assert_equals(parent.childNodes[2].textContent, 'text');
+    }, nodeName + '.append() with one element and text as argument, on a parent having a child.');
+}
+
+test_append(document.createElement('div'), 'Element');
+test_append(document.createDocumentFragment(), 'DocumentFragment');
+</script>
+</html>