[1] Make handle errors look at the timeout first (jakearchibald著, ) <https://github.com/whatwg/xhr/commit/fb2f253f22be5560490742c2288588a299238394>
[2] Request time out and error handling · Issue #212 · whatwg/xhr () <https://github.com/whatwg/xhr/issues/212>
[3] Reacting to timeout first. Fixes #212. by jakearchibald · Pull Request #214 · whatwg/xhr () <https://github.com/whatwg/xhr/pull/214>