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<!DOCTYPE html>
<html>
<body>
<p>Click the button to get the value of outer HTML before remove demo.</p>
<button onclick="myFunction()">Try it</button>
<p>Click the button to get the value of outer HTML after remove demo.</p>
<button onclick="myFunction2()">Remove demo</button>
<p id="demo"></p>
<script>
function myFunction() {
var a = document.getElementsByTagName("HTML")[0];
window.alert(a.outerHTML);
}
function myFunction2() {
document.getElementById('demo').remove();
var a = document.getElementsByTagName("HTML")[0];
window.alert(a.outerHTML);
}
</script>
</body>
</html>
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