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<!DOCTYPE html>
<html>
<body>

<h1 id="header">Old Header</h1>

<script>
var element = document.getElementById("header");
element.innerHTML = "New Header";
</script>

<p>"Old Header" was changed to "New Header"</p>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<h1 id="header">Old Header</h1>

<script>
var element = document.getElementById("header");
element.innerHTML = "New Header";
</script>

<p>"Old Header" was changed to "New Header"</p>

</body>
</html>