让网页变灰色兼容各种浏览器

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html{	filter: grayscale(100%);	-webkit-filter: grayscale(100%);	-moz-filter: grayscale(100%);	-ms-filter: grayscale(100%);	-o-filter: grayscale(100%);	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");	filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);	-webkit-filter: grayscale(1);}