Figuring out if the device can span but is not currently spanning.

[darktears]

It is like MicrosoftEdge/MSEdgeExplainers#377. Basically, if you're using the window segment API there is no way to know that the device is supporting spanning but it's not spanning currently.

That's because when the window isn't spanning getWindowSegments only return 1 (which is the same value as on a desktop/mobile). So, there is no way to invite the user to span the window to provide a better/optimized experience without using the CSS spanning MQ to do so.

@zouhir @kenchris what do you think? Should we address this or should we just say : use the MQs?

[kenchris]

So you want a DOM API? Maybe on the window.screen or the new Window Enumeration API?

[darktears]

Well we multiple options:

• GetWindowSegments returns 0 on desktop/mobile devices that can't have two segments. Just like spanning: none MQ wouldn't match on desktop/mobile platform that can't have two segments ever.
• Add a method somewhere that developer can use to see if multiple segments are supported. A top level supportsMultipleWindowSegments on window just like getWindowSegments.

Just random ideas.