1332251 - Redesign XHR.timeout tests to use Promises?

Status: NEW

(Core :: DOM: Core & HTML, defect, P3)

Description

[Alex Vincent [:WeirdAl]]

I wrote the original tests and implementation for XMLHttpRequest's timeout feature.  Since then, there's been a number of intermittent failures because timeouts are inherently not guaranteed to run in the order of the delay you set them by.

I've been thinking for a while that while the timeout feature itself relies on a certain number of milliseconds passing, the Promises API may provide a more reliable manner of scheduling the exercising of other features (resetting the timeout, or calling abort early, for instance).

Promises were much less mature when I wrote the original feature and tests, and I certainly didn't know very much about them, if anything.