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<!DOCTYPE html> <html> <head> <style> div { width: 100px; height: 100px; background: red; -webkit-transition: width 3s; /* Safari */ -webkit-transition-delay: 1s; /* Safari */ transition: width 3s; transition-delay: 1s; } div:hover { width: 300px; } </style> </head> <body> <p><b>Note:</b> This example does not work in Internet Explorer 9 and earlier versions.</p> <div></div> <p>Hover over the div element above, to see the transition effect.</p> <p><b>Note:</b> The transition effect has a 1 second delay before starting.</p> </body> </html>