HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>querySelectorAll multi</title>
</head>
<body>
  <div id="myBox">
    <div class="note">Note</div>
    <div class="plain">Plain</div>
    <div class="alert">Alert</div>
  </div>
  <pre id="out"></pre>
  <script>
    var myBox = document.getElementById("myBox");
    var matches = myBox.querySelectorAll("div.note, div.alert");
    document.getElementById("out").textContent = matches.length;
  </script>
</body>
</html>

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Element.querySelectorAll — multiple selectors (Try It)