网页黑白

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); } #grayscale");
filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
-webkit-filter: grayscale(1); }