HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS all Widget Example</title>
  <style>
    button {
      background: purple;
      color: white;
      padding: 1rem 2rem;
      border-radius: 999px;
      border: none;
    }

    .widget button {
      all: initial;
      display: inline-block;
      padding: 0.5rem 1rem;
      border: 1px solid #64748b;
      cursor: pointer;
    }
  </style>
</head>
<body>
  <h1>Isolate a Widget with all: initial</h1>

  <button>Site button</button>

  <div class="widget">
    <button>Widget button</button>
  </div>
</body>
</html>

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CSS all Property - Widget Isolation