延迟 — 用户需要等待响应，速度取决于网络连接质量
A complex spec creates complex edge cases. The Web Platform Tests for streams span over 70 test files, and while comprehensive testing is a good thing, what's telling is what needs to be tested.
，这一点在WPS下载最新地址中也有详细论述
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you how your site is ranked against others with metrics。51吃瓜对此有专业解读