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In order to resolve YES, you must be able to hold your finger close to but not touching the screen, and the screen is able to detect that and treat it similarly to hovering your mouse pointer over the element on a desktop device.
https://www.youtube.com/watch?v=7BjG18PzDGU
A prototype is not enough for this to resolve YES, nor is some extreme high end phone that only multi-millionares can afford. Must be something in common use by the middle class.
@Imuli Wow, all the way back in 2014! Does it work in browsers? Is there a "hover" event that web pages can react to like they would with a mouse cursor?
@IsaacKing I think so. I still have one somewhere that I could dig out and test with - assuming I can charge a battery - if that information isn't available online.
@GabiPurcaru I don't have any specific threshold in mind. Anything popular enough that small web developers should keep it in mind when designing their websites.
@GabiPurcaru Ah, good question. Cars are indeed "mobile" in one sense, but that's not usually what people mean by "mobile device". Must be something more like a phone or tablet. Something that people can easily carry with them.
Not terribly relevant to modern usage - but perhaps an interesting aside: Mobile phones are called mobile because they were originally made for use in cars and the name didn't change when they shrunk. That usage stemmed from the radio operators' usage of a mobile radio, which you operate from a vehicle, versus a portable radio, which you carry with you.