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chromium/third_party/blink/web_tests/external/wpt/html/semantics/interactive-elements/commands/legend/input-outside-fieldset-manual.html 

<!doctype html>
<title>Input outside fieldset</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>legend</legend>
</fieldset>
<input onfocus="fail('input outside fieldset was focused')">
<script>
 onkeyup = e => {
   if (e.keyCode === 65) {
     pass();
   }
 }
</script>