html{filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
filter:grayscale(100%);-moz-filter:grayscale(100%);-o-filter:grayscale(100%);-webkit-filter:grayscale(1)}
2020.4.4 website css all gray
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Origin blog.csdn.net/weixin_43870649/article/details/105313066
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