I am trying to wrap my head around the following concepts : What is logical resolution and how is it different from physical resolution or screen resolution of a device? What is CSS pixel ratio? How does it help to know CSS pixel ratio of a device?
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Possible duplicate of [what exactly is device pixel ratio?](http://stackoverflow.com/questions/8785643/what-exactly-is-device-pixel-ratio) – KittMedia Mar 02 '16 at 07:58