使用这些库的价值在于工程师可以在广泛的浏览器和平台上专注地维护和测试它们，这样可省去大量的工作和麻烦。

The value of using these libraries is that dedicated engineers maintain and test them on a wide variety of browsers and platforms, which can save you a lot of work and headache.

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通过查看哪个系统使用某个特定标准，工程师们可以确定一个新标准将对设备维护的影响。

By looking at which systems use a particular standard, the engineers can determine the impact that a new standard will have on equipment maintenance.

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