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<!DOCTYPE html>
<html>
<head>
<style>
.democlass {
  color: red;
}
</style>
</head>
<body>
​
<h1>Hello World</h1>
​
<p>Click the button to create a "class" attribute with the value "democlass" and insert it to the H1 element above.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
  var h1 = document.getElementsByTagName("H1")[0];
  var att = document.createAttribute("class");
  att.value = "democlass";
  h1.setAttributeNode(att);
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_document_createattribute by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:01:40 GMT -->
</html>
​
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