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<!DOCTYPE html> <html> <style> div { border: 1px solid black; padding: 16px; } </style> <body> <h1>The Element Object</h1> <h2>The getElementsByClassName() Method</h2> <div id="myDIV"> <p class="child">I am a paragraph.</p> <p class="child">I am a paragraph.</p> <p class="child">I am a paragraph.</p> </div> <p>Click "Change" to change the size of the second paragraph with class="child":</p> <button onclick="myFunction()">Change</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>