HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>getComputedStyle() — ::after</title>
  <style>
    h3::after { content: " rocks!"; }
  </style>
</head>
<body>
  <h1>pseudo-element</h1>
  <h3 id="title">CodeToFun</h3>
  <button type="button" id="btn">Read ::after</button>
  <pre id="out">Waiting...</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var after = getComputedStyle(document.getElementById("title"), "::after");
      document.getElementById("out").textContent =
        after.getPropertyValue("content");
    };
  </script>
</body>
</html>

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JavaScript getComputedStyle() — pseudo-element (Try It)