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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<body>
​
<h1>outerHTML</h1>
​
<p>Click the button to change the header from a h1 to a h3.</p>
​
<button onclick="myFunction()">Change Header</button>
​
<script>
function myFunction() {
  var x = document.getElementsByTagName("h1")[0];
  x.outerHTML = "<h3>You changed the entire header element and it's content!</h3>";
}
</script>
​
</body>
​
</html> 
​
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