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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS tab-size Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 20px;
      background: #f8fafc;
    }

    pre {
      tab-size: 4;
      background: #0f172a;
      color: #e2e8f0;
      padding: 1rem;
      border-radius: 8px;
      font-family: ui-monospace, monospace;
      line-height: 1.5;
    }
  </style>
</head>
<body>
  <h1>Code Block with Custom Tab Size</h1>
  <p>Each tab character inside the pre element uses a 4-space width.</p>
  <pre>
function example() {
	let x = 1;
	let y = 2;
	return x + y;
}
  </pre>
</body>
</html>

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CSS tab-size Property - Code Block with Four-Space Tabs