<!DOCTYPE html> <html> <head> <style> div{ width:200px; height:200px; transition-property:background-color; transition-duration:3s; -webkit-transition-property:background-color; /* for safari */ -webkit-transition-duration:3s; /* for safari */ background-color:red; } div:hover{ background-color:green; } </style> </head> <body> <div></div> </body> </html>
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