HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>querySelectorAll p</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}</style>
</head>
<body>
  <p>Hello</p>
  <p>World</p>
  <pre id="out"></pre>
  <script>
    var matches = document.querySelectorAll("p");
    document.getElementById("out").textContent =
      "paragraph count: " + matches.length + "\n" +
      "first text: " + (matches[0] ? matches[0].textContent : "(none)");
  </script>
</body>
</html>

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Document.querySelectorAll — all paragraphs (Try It)