HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>querySelectorAll multi</title>
  <style>body{font-family:system-ui,sans-serif;margin:1rem;}div{margin:0.25rem 0;padding:0.35rem;border:1px solid #ccc;}</style>
</head>
<body>
  <div class="note">Note A</div>
  <div class="plain">Plain</div>
  <div class="alert">Alert</div>
  <div class="note">Note B</div>
  <pre id="out"></pre>
  <script>
    var matches = document.querySelectorAll("div.note, div.alert");
    document.getElementById("out").textContent =
      Array.from(matches).map(function (el) { return el.className; }).join(", ");
  </script>
</body>
</html>

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Document.querySelectorAll — note or alert (Try It)