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<!DOCTYPE html> <html> <style> .class1 {background-color:red;width:50px;height:50px} .class2 {background-color:blue;width:50px;height:50px} </style> <body> <h1>HTML DOM Attributes</h1> <h2>The item() Method</h2> <div id="myDiv" class="class1"></div> <p>Click to change the value of the second attribute:</p> <button onclick="myFunction()">Click Me</button> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>