<html>
<body>
<h1>Get outerHTML</h1>
<p>Click the button to alert the outer HTML of the h1 element:</p>
<button onclick="myFunction()">Alert Header</button>
<script>
function myFunction() {
var x = document.getElementsByTagName("h1")[0];
alert(x.outerHTML);
}
</script>
</body>
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</html>