jQuery also supports xPath selector as well CSS, you can get more information from the link below.
You can try it https://github.com/andrejpavlovic/xpathjs
Actually there are a lot of it and there is an window.evaluate method by default.
But the reason why mostly all frameworks using selectors like jQuery/Mootols/Dojo (Sizzle) is that in all modern modern browsers it`s supports almostly native and gets fall back if it doesn't. So in most ways it's faster.