Share a CSS special effect code that makes the entire site gray

Share a CSS special effect code that makes the entire site gray, a WeChat applet. I would like to share the following

Compatible with mainstream browsers, the CSS code for graying the entire site:

1. html { 
       -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=&#39;http://www.w3.org/2000/svg&#39;><filter id=&#39;grayscale&#39;><feColorMatrix type=&#39;matrix&#39;  values=&#39;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&#39;/></filter></svg>#grayscalerayscale");
       filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); zoom: 1;
   }

There are also js grayscale codes available:
grayscale(document.body);
grayscale.js Please search by yourself.

html {
    -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
    filter: url(desaturate.svg#grayscale);
    filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
}

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