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Detect touch support
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| /** | |
| * Detect "touch" support and act accordingly. | |
| * Adds `touch` class and assumes there is `no-touch` class added in <html> element. | |
| */ | |
| let hasTouch = false; | |
| const docEl = document.documentElement; | |
| if (('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch || navigator.msMaxTouchPoints) { | |
| docEl.className = docEl.className.replace(/(^|\s)no-touch(\s|$)/, ' touch '); | |
| hasTouch = true; | |
| } |
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