<!DOCTYPE html>
<html>
<body>
<form action="form_action.asp">
E-mail: <input type="email" id="myEmail" name="usremail">
<input type="submit">
</form>
<p>Click the "Try it" button to allow multiple values (emails) for the email field on form submission.</p>
<p><strong>Tip:</strong> Try to type in more than one email before and after you have clicked on the "Try it" button. Separate each email with a comma, like: mail@example.com, mail2@example.com.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("myEmail").multiple = true;
document.getElementById("demo").innerHTML = "The email field now accept multiple values.";
}
</script>
</body>
</html>