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HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Proportional To (∝) in HTML</title>
  <style>
    #point::after {
      content: "\221D";
    }
  </style>
</head>
<body>
  <p>Using Named Entity: y &prop; x</p>
  <p>Using Hex Code: y &#x221D; x</p>
  <p>Using Decimal: y &#8733; x</p>
  <p>Using Direct Character: y ∝ x</p>
  <p>Using CSS Entity: y <span id="point"></span> x</p>
</body>
</html>

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HTML Entity for Proportional To (∝)