<html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <style> div{ transition: 0s background-color; } div:hover{ background-color:red; transition-delay:3s; } </style> <div>延遲hover顯示時間（鼠標懸停此處，3秒后顯示紅色背景）</div> </body> </html>