HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>createExpression context</title>
  <style>body{font-family:system-ui,sans-serif;padding:1.5rem;} #panel{border:1px solid #ccc;padding:0.75rem;} pre{border:1px solid #ccc;padding:0.75rem;}</style>
</head>
<body>
  <div id="panel"><span>Alpha</span> <span>Beta</span></div>
  <p><span>Outside panel (ignored)</span></p>
  <button id="btn" type="button">Evaluate .//span on #panel</button>
  <pre id="out">Click the button</pre>
  <script>
    document.getElementById("btn").addEventListener("click", function () {
      var section = document.getElementById("panel");
      var expr = document.createExpression(".//span");
      var result = expr.evaluate(section, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE);
      var lines = ["snapshotLength: " + result.snapshotLength];
      for (var i = 0; i < result.snapshotLength; i++) {
        lines.push(result.snapshotItem(i).textContent);
      }
      document.getElementById("out").textContent = lines.join("\n");
    });
  </script>
</body>
</html>

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Document.createExpression — context node (Try It)