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<!DOCTYPE html> <html> <head> <style> .div1 { width: 300px; height: 100px; border: 1px solid blue; } .div2 { width: 300px; height: 100px; padding: 50px; border: 1px solid red; } </style> </head> <body> <h1>Without box-sizing</h1> <div class="div1">This div is smaller (width is 300px and height is 100px).</div> <br> <div class="div2">This div is bigger (width is also 300px and height is 100px).</div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>