Window.devicePixelRatio

Read-only property that returns the ratio of the (vertical) size of one physical pixel on the current display device to the size of one CSS pixel.

IE Edge Firefox Chrome Safari Opera iOS Safari Opera Mini Android Browser Blackberry Browser Opera Mobile Chrome for Android Firefox for Android IE Mobile UC Browser for Android Samsung Internet QQ Browser Baidu Browser
49
56 9.3 4.4
14 52 57 10 10.0-10.2 4.4.3-4.4.4 4
11 15 53 58 10.1 44 10.3 all 56 10 37 57 52 11 11.4 5 1.2 7.12
54 59 TP 45
55 60 46
56 61

Notes

As the page is zoomed in the number of device pixels that one CSS pixel covers increases, and therefore the value of devicePixelRatio will also increase.

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