index.html
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta charset="utf-8"> <title>CSS3动画效果</title> <link rel="stylesheet" type="text/css" href="style.css"> </head> <body> <div>我是HTML5</div> </body> </html>
style.css
@charset "utf-8"; body { margin: 100px; } div { width: 200px; height: 200px; background-color: white; border: 1px solid green; /* animation-name: myani; animation-duration: 1s; animation-timing-function: ease;*/ /*animation-delay: 1s;*/ /*animation-iteration-count: infinite;*/ /*animation-iteration-count: 4;*/ /*animation-direction: alternate;*/ /*animation-play-state: paused;*/ /*animation-fill-mode: forwards;*/ /*animation-fill-mode: backforwards;*/ /*animation-iteration-count: 3; animation-direction: alternate; animation-fill-mode: both;*/ animation: myani 1s ease 2 alternate 1s both; } @keyframes myani { /* 0%, 100% { background-color: white; margin-left: 0px; } 50% { background-color: black; margin-left: 100px; }*/ form { background-color: white; margin-left: 0px; } to { background-color: black; margin-left: 100px; } }