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<!DOCTYPE html>
<html>
<body>
​
<form id="form1">
<button id="btn1" type="button">HTML</button>
</form>
​
<p>Click the "Try it" button to display the id of the form the HTML button belongs to:</p>
​
<button onclick="myFunction()">Try it</button>
​
<p id="demo"></p>
​
<script>
function myFunction() {
  var x = document.getElementById("btn1").form.id;
  document.getElementById("demo").innerHTML = x;
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/js/tryit.asp?filename=tryjs_button_form by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:40:21 GMT -->
</html>
​
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