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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\311"}</style>
</head>
<body>
  <h1>Inverted Breve (U+0311) in HTML</h1>
  <p>Combined: o&#x0311; a&#x0311;</p>
  <p>Mark alone: &#x0311;</p>
  <p id=point>CSS on base: o</p>
</body>
</html>

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HTML Entity for Inverted Breve (U+0311)