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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"); 
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_element_setattribute1 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:02:20 GMT -->
</html>
​
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