On Mon, Jan 28, 2019 at 12:22 PM Brion Vibber via Commons-l <commons-l@lists.wikimedia.org> wrote:
IE 11 users will receive low-resolution, slow JavaScript-based video playback instead. If you find this is troublesome, the recommended solution is to switch to any other browser.

Will they get a warning that they should try another browser? This seems like a sensible limitation, as long as the user has a chance of figuring out why they are being limited.