HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS [class~=highlight] Example</title>
  <style>
    [class~="highlight"] {
      background: #fef9c3;
      border-left: 4px solid #eab308;
      padding: 0.5rem 0.65rem;
    }

    p {
      margin-bottom: 0.75rem;
      line-height: 1.5;
    }
  </style>
</head>
<body>
  <h1>Important Notes</h1>
  <p class="intro">This is a normal paragraph.</p>
  <p class="intro highlight">This paragraph is important.</p>
  <p class="highlight">Another highlighted paragraph.</p>
</body>
</html>

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CSS [attribute~=value] - class~=highlight