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chromium/content/test/data/accessibility/html/min-role-tabbable-group.html 

<!--
@BLINK-ALLOW:scrollable=true
@BLINK-ALLOW:className*
@BLINK-ALLOW:focusable*
-->
<!DOCTYPE html>
<style>
  body { font-style: monospace; width: 999px; }
  .scrollable { margin-bottom: 50px; height: 25px; width: 20em;}
  .not-scrollable { margin-bottom: 50px; height: 250px; width: 200em}
</style>

<!-- Must be tabbable, not just focusable, to receive minimum role of group -->
<div tabindex="0">Tabindex=0</div>
<div tabindex="-1">Tabindex=-1</div>

<!-- Receives role of group if keyboard focusable scrollers feature adds it
  to the tab order -->
<div class="scrollable" style="overflow: auto;">
  <p>Scrollable
</div>

<div class="not-scrollable" style="overflow: auto;">
  <p>Scrollable
</div>