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## CSS怎么使网页全部变成灰色

2016-10-13
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Desaturating a color image couldn’t be simpler with CSS3. We’ll apply the filter as a class, as you’d typically desire several images to be affected by the code at the same time:

    img.desaturate { filter: grayscale(100%); }

Naturally, all current browsers implement CSS3 filters via vendor prefixes, so our first job is to insert that code, writing in CSS that does not yet exist in order to future-proof our work:

    img.desaturate { filter: grayscale(100%);

    -webkit-filter: grayscale(100%);

    -moz-filter: grayscale(100%);

    filter: grayscale(100%);

    }

Applying the class to the image is easy:

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