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<!DOCTYPE html> <html> <head> <style> div.ex1 { width:500px; margin: auto; border: 3px solid #73AD21; } div.ex2 { max-width:500px; margin: auto; border: 3px solid #73AD21; } </style> </head> <body> <div class="ex1">This div element has width: 500px;</div> <br> <div class="ex2">This div element has max-width: 500px;</div> <p><strong>Tip:</strong> Drag the browser window to smaller than 500px wide, to see the difference between the two divs!</p> </body> </html>