css 网页置灰

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body *{ -webkit-filter: grayscale(100%); /* webkit */ -moz-filter: grayscale(100%); /*firefox*/ -ms-filter: grayscale(100%); /*ie9*/ -o-filter: grayscale(100%); /*opera*/ filter: grayscale(100%); filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); filter:gray; /*ie9- */ }