[Firefox] Touch event support has been re-enabled on Windows desktop

[twbs-notify]

https://www.fxsitecompat.com/en-CA/docs/2016/touch-event-support-has-been-re-enabled-on-windows-desktop/

[mdo]

Unsure if we should be doing anything for this on our end?

[patrickhlauke]

i don't think so, but i'll double-check if any of our components misbehave

[patrickhlauke]

Two areas where this (as well as a recent change in Chrome, where touch events are exposed on touch-enabled desktop machines, like Surface 3) affects us.

• dropdown.js behavior to add a backdrop on touch to work around an iOS event bubbling/delegation hack (reworked in Replace dropdown backdrop hack with cleaner JS-only hack #22426)
• carousel.js does not add the mouse listeners to pause the carousel when the user is over it when touch is present (which means on touch-enabled laptops/desktops, or if user has mouse paired with a touch device like Android phone, the carousel never pauses even on mouseover - working on a fix for that just now) [edit: Fix carousel "hover" behavior on touch-enabled devices #22442]