Mac has high X resolution, so please, dev's,
make thus limit more than 4K. See
* iMac (Retina 5K, 27-inch, Late 2014) and later displays have a
5120-by-2880 native resolution with support for millions of colors.
* iMac (Retina 4K, 21.5-inch, Late 2015) displays have a 4096-by-2304
native resolution with support for millions of colors.
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