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<!DOCTYPE html> <html> <style> .democlass { color: red; } </style> <body> <h1 id="myH1">The Element Object</h1> <h2>The setAttribute() Method</h2> <p>Click "Add Class" to add a class attribute to the h1 element:</p> <button onclick="myFunction()">Add Class</button> <script> function myFunction() { document.getElementById("myH1").setAttribute("class", "democlass"); } </script> </body> <!-- /jsref/tryit.asp?filename=tryjsref_element_setattribute1 </html>
