HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>evaluate MDN h2</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} h2{margin:0.75rem 0 0.25rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <h2>Intro</h2>
  <p>First section</p>
  <h2>Details</h2>
  <p>Second section</p>
  <button id="btn" type="button">List h2 with evaluate()</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      const headings = document.evaluate(
        "/html/body//h2",
        document,
        null,
        XPathResult.ANY_TYPE,
        null
      );
      const texts = [];
      let node = headings.iterateNext();
      while (node) {
        texts.push(node.textContent.trim());
        node = headings.iterateNext();
      }
      document.getElementById("out").textContent = texts.join(" | ");
    });
  </script>
</body>
</html>

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Document.evaluate — MDN h2 list (Try It)