nameditem-img-name-added-cached-list.html

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This WPT test may be referenced by the following Test IDs:
- /html/dom/documents/dom-tree-accessors/nameditem-img-name-added-cached-list.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>Named items: img becomes exposed by id when a name is added, invalidating a cached list</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>

<object id="foo"></object>

<object id="foo"></object>

<img id="foo">

<script>

test(function() {

  let img = document.querySelector("img#foo");

  let collection = document.foo;

  assert_equals(collection.length, 2, "before adding a name");

  assert_false([...collection].includes(img), "before adding a name does not contain img");

  img.setAttribute("name", "x");

  assert_equals(document.foo.length, 3, "after adding a name");

  assert_in_array(img, [...document.foo], "after adding a name contains img");

}, "An img with an id gets exposed by its id, invalidating an already-cached named item collection, once a name attribute is added.");

</script>