HTML 网页黑白显示

            html {
                -webkit-filter: grayscale(100%);
                -moz-filter: grayscale(100%);
                -ms-filter: grayscale(100%);
                -o-filter: grayscale(100%);
                filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
                _filter: none;
            }