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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.fontsize()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var contentString = "Hello, world";
    var html = contentString.fontsize(7);
    document.getElementById("out").textContent =
      html + "\n(invalid modern markup — <font> was removed from HTML)";
  </script>
</body>
</html>

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String.fontsize() — innerHTML legacy (Try It)