focusable-legend-sibling-manual.html

<!doctype html>
<title>Focusable legend sibling</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=../common/accesskey.js></script>
<p>Press the access key combination for "a". <kbd></kbd></p>
<fieldset>
 <legend accesskey=a>first legend</legend>
 <legend tabindex=0 onfocus="fail('sibling legend was focused')">second legend</legend>
</fieldset>
<script>
 onkeyup = e => {
   if (e.keyCode === 65) {
     pass();
   }
 }
</script>

chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/commands/legend/focusable-legend-sibling-manual.html