Touch screen devices (code from Rainer Haessner)

Here comes what Rainer mentioned in our meeting from July 2nd:

```js

const hasTouchScreen = function () {

let hasTouchScreen = false;

if ("maxTouchPoints" in navigator) {

hasTouchScreen = navigator.maxTouchPoints > 0;

} else if ("msMaxTouchPoints" in navigator) {

hasTouchScreen = navigator.msMaxTouchPoints > 0;

} else {

let mQ = window.matchMedia && matchMedia("(pointer:coarse)");

if (mQ && mQ.media === "(pointer:coarse)") {

hasTouchScreen = !!mQ.matches;

} else if ("orientation" in window) {

hasTouchScreen = true; // deprecated, but good fallback

} else {

// Only as a last resort, fall back to user agent sniffing

let UA = navigator.userAgent;

hasTouchScreen =

/\b(BlackBerry|webOS|iPhone|IEMobile)\b/i.test(UA) || /\b(Android|Windows Phone|iPad|iPod)\b/i.test(UA);

}

}

return hasTouchScreen;

};

```