链接类型：prefetch

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This feature is not Baseline because it does not work in some of the most widely-used browsers.

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关键字 prefetch 作为元素 <link> 的属性 rel 的值，是为了提示浏览器，用户未来的浏览有可能需要加载目标资源，所以浏览器有可能通过事先获取和缓存对应资源，优化用户体验。

规范

Specification
HTML # link-type-prefetch