Fyrd/caniuse — pull request #237 by MayhemYDG (2013-06-18 10:25:38+00:00)
Title: Update xhr timeout support bug.

Chrome supports it since M29:
https://code.google.com/p/chromium/issues/detail?id=231959
Firefox supports it since M12:
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest#Browser_Compatibility