File: setAttribute.html

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<!DOCTYPE html>
<html>
<head>
<style>
.democlass {
  color: red;
}
</style>
</head>
<body>

<h1>Hello World</h1>

<p>Click the button to add a class attribute with the value of "democlass" to the h1 element.</p>

<button onclick="myFunction()">Try it</button>

<script>
function myFunction() {
  document.getElementsByTagName("H1")[0].setAttribute("class", "democlass"); 
  window.alert(document.getElementsByTagName("HTML")[0].outerHTML);
}
</script>

</body>
</html>