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移动端使用 rem 单位时 css sprites 定位问题
source link: https://juejin.im/post/5b2611665188257494641b59
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现在开发移动端 wap 页面，相信大家都会使用强大的 rem 单位去适配各种机型和屏幕；为了减少网络请求数量，提高网页访问性能，一般都会把多个小 icon 合并成一张 sprite 图，然后根据 background-position 进行定位；但是由于计算机
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