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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\340"}</style>
</head>
<body>
  <h1>Grave Tone Mark (U+0340) in HTML</h1>
  <p>Combining mark alone: &#x0340;</p>
  <p>Using Hex on base letter: a&#x0340; e&#x0340;</p>
  <p>Using Decimal: o&#832; u&#832;</p>
  <p id=point>CSS Entity on pseudo-element: </p>
  <p>Compare accent: a&#x0300; vs tone: a&#x0340;</p>
</body>
</html>

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HTML Entity for Grave Tone Mark (U+0340)