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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; transition: width 2s; } div:hover { width: 300px; } </style> </head> <body> <h1>The transition Property</h1> <p>Hover over the div element below, to see the transition effect:</p> <div></div> </body> </html>