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

<!DOCTYPE html>
<!-- Minimum role from https://github.com/w3c/html-aam/pull/454 -->
<!-- autofocus gets a minimum role of group -->
<div autofocus>Autofocus</div>
<!-- draggable gets a minimum role of group -->
<div draggable>Draggable</div>
<!-- For now, tabindex does not have a minimum role. Consider having tabindex=0 using a minimum role of group -->
<div tabindex="0">Tabindex=0</div>
<div tabindex="-1">Tabindex=-1</div>
<!-- popover targets also have a minimum role, tested in popover-api.html -->