<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title> New Document </title>
<meta name="Generator" content="EditPlus">
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{
filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 3.5+ */
-webkit-filter: grayscale(100%); /* chrome+ */
filter: grayscale(100%); /* 未来浏览器 */
filter: gray; /* ie7-9 */
filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); /*ie7-9 */
}
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<body>
<span style='color:red;'>sdfs</span>
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