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编辑您的代码：
<!DOCTYPE html> <html> <head> <style> div { width:100px; height:100px; background:red; position:relative; animation:mymove 5s infinite; -moz-animation:mymove 5s infinite; /* Firefox */ -webkit-animation:mymove 5s infinite; /* Safari and Chrome */ -o-animation:mymove 5s infinite; /* Opera */ } @keyframes mymove { from {top:0px;} to {top:200px;} } @-moz-keyframes mymove /* Firefox */ { from {top:0px;} to {top:200px;} } @-webkit-keyframes mymove /* Safari and Chrome */ { from {top:0px;} to {top:200px;} } @-o-keyframes mymove /* Opera */ { from {top:0px;} to {top:200px;} } </style> </head> <body> <p><b>注释：</b>本例在 Internet Explorer 中无效。</p> <div></div> </body> </html>
查看结果: