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                            CSS怎么使网页全部变成灰色

                            2016-10-13

                            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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