<!DOCTYPE html>
<html>
<body>
<form id="frm1" accept-charset="ISO-8859-1">
First name: <input type="text" name="fname" value="Donald"><br>
Last name: <input type="text" name="lname" value="Duck"><br>
</form>
<p>Click "Try it" to display accept-charset of the form:</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var x = document.getElementById("frm1").acceptCharset;
document.getElementById("demo").innerHTML = x;
}
</script>
</body>
</html>