Get the button that caused the submit from the form submit event

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I’m trying to find the value of the submit button that triggered the form to submit, so in accordance I can do differents things, actually I use this:

$("#regform").on('submit', function(e) {
  if (($(document.activeElement).val()) == "cf") {
    e.preventDefault();
    // This doesnt work on iOs Devices
  }
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form action="action.php" method="post" id="regform" class="regform" accept-charset="utf-8">
  <button class="btn btn-outline-primary" type="submit" id="check-cf" value="cf">Check CF</button>
  <input type="submit" name="submit" class="btn btn-success btn-lg btn-block" value="Reg">
</form>

document.activeElement doesn’t work in many cases. What should I use nowadays to be compatible to achieve that?

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