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<!DOCTYPE html>
<html>
<body>
​
<iframe id="myFrame" src="../default.html" height="200" width="250"></iframe>
​
<p>Click the button to change the width of the iframe to 400px.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  document.getElementById("myFrame").width = "400";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_iframe_width2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:46:35 GMT -->
</html>
​
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