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<!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>