x
<html><head><style>div{width:200px;height:200px;transition-property:background-color;transition-delay:2s;transition-property:background-color; /* for safari */transition-delay:2s; /* for safari */background-color:red;}div:hover{background-color:green; }</style> </head><body> <div></div> <p>Place cursor and wait for two seconds</p></body> </html>