HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getComputedStyle() — camelCase</title>
</head>
<body>
  <h1>camelCase access</h1>
  <div id="box" style="color:navy;font-size:18px;padding:8px">Hello</div>
  <button type="button" id="btn">Read</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var styles = getComputedStyle(document.getElementById("box"));
      document.getElementById("out").textContent =
        styles.fontSize + "\n" + styles.backgroundColor;
    };
  </script>
</body>
</html>

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JavaScript getComputedStyle() — camelCase (Try It)