console 命令行工具 X clear

console

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>自学web</title>
    <body>

<div></div>

</body>
</html>

<style> 
div
{
	width:100px;
	height:100px;
	background:red;
	position:relative;
	animation:myfirst 5s;
	-webkit-animation:myfirst 5s; /* Safari and Chrome */
}

@keyframes myfirst
{
	0%   {background:red; left:0px; top:0px;}
	25%  {background:yellow; left:200px; top:0px;}
	50%  {background:blue; left:200px; top:200px;}
	75%  {background:green; left:0px; top:200px;}
	100% {background:red; left:0px; top:0px;}
}

@-webkit-keyframes myfirst /* Safari and Chrome */
{
	0%   {background:red; left:0px; top:0px;}
	25%  {background:yellow; left:200px; top:0px;}
	50%  {background:blue; left:200px; top:200px;}
	75%  {background:green; left:0px; top:200px;}
	100% {background:red; left:0px; top:0px;}
}
</style>