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<html><style>.democlass {color: red;}</style><body><h1>The Document Object</h1><h2>The createAttribute() and setAttributeNode() Methods</h2><p>Click "Add" to create a class attribute and add it to first h1 element.</p><button onclick="myFunction()">Add</button><script>function myFunction() {// Create a class attribute:const att = document.createAttribute("class");// Set a value of the class attributeatt.value = "democlass";// Add the class attribute to the first h1;document.getElementsByTagName("h1")[0].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, 05 Sep 2022 15:18:43 GMT --></html>