1 files changed, 58 insertions, 0 deletions
diff --git a/testing/web-platform/tests/dom/nodes/Element-children.html b/testing/web-platform/tests/dom/nodes/Element-children.html
new file mode 100644
index 000000000..c0210f966
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/Element-children.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<title>HTMLCollection edge cases</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<div id="test"><img><img id=foo><img id=foo><img name="bar"></div>
+<script>
+setup(function() {
+  // Add some non-HTML elements in there to test what happens with those.
+  var container = document.getElementById("test");
+  var child = document.createElementNS("", "img");
+  child.setAttribute("id", "baz");
+  container.appendChild(child);
+
+  child = document.createElementNS("", "img");
+  child.setAttribute("name", "qux");
+  container.appendChild(child);
+});
+
+test(function() {
+  var container = document.getElementById("test");
+  var result = container.children.item("foo");
+  assert_true(result instanceof Element, "Expected an Element.");
+  assert_false(result.hasAttribute("id"), "Expected the IDless Element.")
+})
+
+test(function() {
+  var container = document.getElementById("test");
+  var list = container.children;
+  var result = [];
+  for (var p in list) {
+    if (list.hasOwnProperty(p)) {
+      result.push(p);
+    }
+  }
+  assert_array_equals(result, ['0', '1', '2', '3', '4', '5']);
+  result = Object.getOwnPropertyNames(list);
+  assert_array_equals(result, ['0', '1', '2', '3', '4', '5', 'foo', 'bar', 'baz']);
+
+  // Mapping of exposed names to their indices in the list.
+  var exposedNames = { 'foo': 1, 'bar': 3, 'baz': 4 };
+  for (var exposedName in exposedNames) {
+    assert_true(exposedName in list);
+    assert_true(list.hasOwnProperty(exposedName));
+    assert_equals(list[exposedName], list.namedItem(exposedName));
+    assert_equals(list[exposedName], list.item(exposedNames[exposedName]));
+    assert_true(list[exposedName] instanceof Element);
+  }
+
+  var unexposedNames = ['qux'];
+  for (var unexposedName of unexposedNames) {
+    assert_false(unexposedName in list);
+    assert_false(list.hasOwnProperty(unexposedName));
+    assert_equals(list[unexposedName], undefined);
+    assert_equals(list.namedItem(unexposedName), null);
+  }
+});
+</script>