<!DOCTYPE html>
<html>
<body>
<form id="frm1" action="form_action.asp">
<button id="btn1" name="subject" type="submit" value="fav_HTML">HTML</button>
<button id="btn2" name="subject" type="submit" value="fav_CSS">CSS</button>
</form>
<p>Click the "Try it" button to return the value of the "HTML" button:</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("btn1").value;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>