chromium/content/test/data/accessibility/event/aria-controls-changed.html

<!--
@UIA-WIN-DENY:*
@UIA-WIN-ALLOW:ControllerFor*
-->
<!DOCTYPE html>
<div id="radiogroup" role="radiogroup">
  <div id="radio1" role="radio">radio1</div>
  <div id="radio2" role="radio">radio2</div>
  <div id="radio3" role="radio">radio3</div>
</div>

<input id="input1" type="text">
<input id="input2" type="text">
<button role="button" aria-controls="input1"></button>

<script>
  var go_passes = [
    () => document.querySelector('div[role=radiogroup]').setAttribute(
                                 'aria-controls', 'radio1 radio2 radio3'),
    () => document.querySelector('button[role=button]').setAttribute(
                                 'aria-controls', 'input2'),
  ];

  var current_pass = 0;
  function go() {
    go_passes[current_pass++].call();
    return current_pass < go_passes.length;
  }
</script>