HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS class ~= vs *= Example</title>
  <style>
    /* Matches class="btn" or class="btn primary" — not "btn-large" */
    [class~="btn"] {
      outline: 2px solid #2563eb;
      padding: 0.35rem 0.65rem;
      border-radius: 4px;
      display: inline-block;
      margin-right: 0.5rem;
      margin-bottom: 0.5rem;
    }

    /* Also matches class="btn-large" */
    [class*="btn"] {
      background: #fef9c3;
      padding: 0.35rem 0.65rem;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 0.5rem;
    }
  </style>
</head>
<body>
  <h1>~= vs *= for btn</h1>
  <span class="btn">btn — matched by ~=</span>
  <span class="btn-large">btn-large — *= only</span>
</body>
</html>

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CSS [attribute~=value] - ~= vs *=