Element-setAttribute-crbug-1138487.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
// Regression test for crbug.com/1138487.
//
// It was possible for a non-ASCII-lowercase string to be used when inserting
// into the attribute collection if a hashtable encountered it during probing
// while looking for the ASCII-lowercase equivalent.
//
// This caused such a string to be illegally used as an attribute name, thus
// causing inconsistent behavior in future attribute lookup.
test(() => {
  const el = document.createElement('div');
  el.setAttribute('labelXQL', 'abc');
  el.setAttribute('_valueXQL', 'def');
  assert_equals(el.getAttribute('labelXQL'), 'abc');
  assert_equals(el.getAttribute('labelxql'), 'abc');
  assert_equals(el.getAttribute('_valueXQL'), 'def');
  assert_equals(el.getAttribute('_valuexql'), 'def');
}, "Attributes first seen in mixed ASCII case should not be corrupted.");
</script>

chromium/third_party/blink/web_tests/external/wpt/dom/nodes/Element-setAttribute-crbug-1138487.html