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<!DOCTYPE html>
<html>
<body>
<form id="myForm" action="/action_page.php">
First name: <input type="text" name="fname"><br>
Last name: <input type="text" name="lname"><br>
<button id="myBtn" type="button" value="Submit">Submit</button>
</form>
<p>The "Submit" button above will not submit the form, because of the button type (type="button" just makes the button clickable, and will not submit form-data).</p>
<p>Click the "Try it" button below to change the type of the "Submit" button above from "button" to "submit".</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myBtn").type = "submit";
  document.getElementById("demo").innerHTML = "The Submit button now works as it should.";
}
</script>
</body>
</html>