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

<!--
@WIN-ALLOW:MULTISELECTABLE
-->
<!DOCTYPE html>

<div role="grid"></div>
<div role="listbox"></div>
<div role="tablist"></div>
<div role="tree" aria-multiselectable="true"></div>
<div role="treegrid" aria-multiselectable="true"></div>

<script>
  function go() {
    document.querySelector('div[role=grid]').setAttribute('aria-multiselectable', true);
    document.querySelector('div[role=listbox]').setAttribute('aria-multiselectable', true);
    document.querySelector('div[role=tablist]').setAttribute('aria-multiselectable', true);
    document.querySelector('div[role=tree]').setAttribute('aria-multiselectable', false);
    document.querySelector('div[role=treegrid]').setAttribute('aria-multiselectable', false);
  }
</script>