HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getComputedStyle() — basic</title>
</head>
<body>
  <div id="example" style="color: navy; font-size: 18px; padding: 8px;">Hello, CodeToFun!</div>
  <button type="button" id="readBtn">Read styles</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("readBtn").onclick = function () {
      var styles = window.getComputedStyle(document.getElementById("example"));
      document.getElementById("out").textContent =
        "Color: " + styles.getPropertyValue("color") + "\n" +
        "Font size: " + styles.getPropertyValue("font-size");
    };
  </script>
</body>
</html>

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JavaScript getComputedStyle() — color and font (Try It)