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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\222E"}</style>
</head>
<body>
  <h1>Contour Integral (&#x222E;) in HTML</h1>
  <p>Using Hex Code: &#x222E;</p>
  <p>Using HTML Code: &#8750;</p>
  <p>Using HTML Entity: &conint;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Calculus: &conint; f(z) dz</p>
  <p>Not standard integral &int; (U+222B) or clockwise &#x2231; (U+2231)</p>
</body>
</html>

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HTML Entity for Contour Integral (∮)