CSS之网页变灰色

<style>html {    -webkit-filter: grayscale(100%);    -moz-filter: grayscale(100%);    -ms-filter: grayscale(100%);    -o-filter: grayscale(100%);    filter: url("data:image/svg+xml;utf8,#grayscale");    filter: gray;    filter: PRogid:DXImageTransform.Microsoft.BasicImage(grayscale=1);}</style>