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<!DOCTYPE html>
<html>
<body>
<p>Enter names in the fields, then click "Submit" to submit the form:</p>
<form id="frm1" action="/action_page.php">
  First name: <input type="text" name="fname"><br>
  Last name: <input type="text" name="lname"><br><br>
  <input type="button" onclick="myFunction()" value="Submit">
</form>
<script>
function myFunction() {
  document.getElementById("frm1").submit();
}
</script>
</body>
</html>