nameditem-tree-order.html

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This WPT test may be referenced by the following Test IDs:
- /html/dom/documents/dom-tree-accessors/nameditem-tree-order.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset=utf-8>

<title>Named items: collection is in tree order after name mutation</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>

<img id=s1 name="a">

<img id=s2 name="a">

<img id=s3 name="a">

<script>

test(function() {

  var collection = document.a;

  assert_equals(collection.length, 3);

  assert_array_equals([collection[0], collection[1], collection[2]],

                      [s1, s2, s3], "initial order");

  assert_equals(document.a, collection, "collection is stable");

  s2.name = "b";

  assert_equals(document.a, collection, "collection is stable after removing name");

  assert_array_equals([collection[0], collection[1]],

                      [s1, s3], "order after removing name");

  s2.name = "a";

  assert_equals(document.a, collection, "collection is stable after restoring name");

  assert_array_equals([collection[0], collection[1], collection[2]],

                      [s1, s2, s3], "order after restoring name");

}, "A named item collection is in tree order even after an element's name is mutated.");

</script>