Fix last child check.

Ugh Differential Revision: https://phabricator.services.mozilla.com/D224302 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1919031 gecko-commit: d8b7f10eb81d003d51523bbaea87ccc6b0b36abf gecko-reviewers: smaug
web-platform-tests · Oct 3, 2024 · db4fbbb · db4fbbb
1 parent 947f66f
commit db4fbbb
Showing 1 changed file with 23 additions and 0 deletions.
diff --git a/dom/nodes/Node-childNodes-cache.html b/dom/nodes/Node-childNodes-cache.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Node.childNodes caching bug</title>
+<link rel=help href="https://bugzilla.mozilla.org/show_bug.cgi?id=1919031">
+<link rel=author title="Emilio Cobos Álvarez" href="mailto:[email protected]">
+<link rel=author title="Mozilla" href="https://mozilla.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="target"><div id="first"></div><div id="second"></div><div id="third"></div><div id="last"></div></div>
+<script>
+test(function() {
+  let target = document.getElementById("target");
+  let second = target.childNodes[1];
+  assert_equals(second.id, "second");
+  second.remove();
+  assert_equals(target.childNodes[4], undefined, "Out of bounds elements are undefined");
+  assert_equals(target.childNodes[3], undefined, "Out of bounds elements are undefined");
+  assert_equals(target.childNodes.length, 3);
+  assert_equals(target.childNodes[0].id, "first");
+  assert_equals(target.childNodes[1].id, "third");
+  assert_equals(target.childNodes[2].id, "last");
+});
+</script>