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diff --git a/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/nameditem-names.html b/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/nameditem-names.html
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+++ b/testing/web-platform/tests/html/dom/documents/dom-tree-accessors/nameditem-names.html
@@ -0,0 +1,101 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Named items: supported property names</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-document-nameditem">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<embed name="exposed_embed">
+  <embed name="not_exposed_embed">
+  </embed>
+</embed>
+<form name="form">
+</form>
+<iframe name="iframe">
+</iframe>
+<img name="img">
+<object name="exposed_object_with_name">
+  <object name="not_exposed_object_with_name">
+  </object>
+</object>
+<object id="exposed_object_with_id">
+  <object id="not_exposed_object_with_id">
+  </object>
+</object>
+<img name="img_with_id" id="img_id">
+<img id="img_with_just_id">
+<template id="template">
+  <img name="img_in_template">
+</template>
+<img name="42">
+<script>
+var names = Object.getOwnPropertyNames(document);
+
+test(function() {
+  assert_true(names.includes("exposed_embed"))
+}, "An embed name appears in a document's property names if the embed is exposed.");
+
+test(function() {
+  assert_false(names.includes("not_exposed_embed"))
+}, "An embed name does not appears in a document's property names if the embed is inside another embed.");
+
+test(function() {
+  assert_true(names.includes("form"))
+}, "A form name appears in a document's property names.");
+
+test(function() {
+  assert_true(names.includes("iframe"))
+}, "An iframe name appears in a document's property names.");
+
+test(function() {
+  assert_true(names.includes("img"))
+}, "An img name appears in a document's property names when the img has no id.");
+
+test(function() {
+  assert_true(names.includes("exposed_object"))
+}, "An object name appears in a document's property names if the object is exposed.");
+
+test(function() {
+  assert_true(names.includes("exposed_object_with_id"))
+}, "An object id appears in a document's property names if the object is exposed.");
+
+test(function() {
+  assert_false(names.includes("not_exposed_object_with_name"))
+}, "An object name does not appear in a document's property names if the object is inside another object.");
+
+test(function() {
+  assert_false(names.includes("not_exposed_object_with_id"))
+}, "An object id does not appear in a document's property names if the object is inside another object.");
+
+test(function() {
+  assert_true(names.includes("img_with_id"))
+}, "An img name appears in a document's property names when the img has an id.");
+
+test(function() {
+  assert_true(names.includes("img_id"))
+}, "An img id appears in a document's property names when the img has a name.");
+
+test(function() {
+  assert_false(names.includes("img_with_just_id"))
+}, "An img id does not appear in a document's property names when the img has no name.");
+
+test(function() {
+  assert_true(names.includes("42"))
+}, "A document's property names can include integer strings.");
+
+test(function() {
+  assert_false(names.includes("template"))
+}, "A template name does not appear in a document's property names.");
+
+test(function() {
+  assert_false(names.includes("img_in_template"))
+}, "An img name does not appear in a document's property names when the img is in a template's document fragment.");
+
+test(function() {
+  var form_index = names.indexOf("form");
+  assert_equals(names.indexOf("iframe"), form_index + 1);
+  assert_equals(names.indexOf("img"), form_index + 2);
+  assert_greater_than(names.indexOf("img_id"), names.indexOf("img"));
+  assert_greater_than(names.indexOf("42"), names.indexOf("img_id"));
+}, "A document's property names appear in tree order.");
+</script>