The ratio between physical pixels and logical CSS pixels.
Other resources
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devicePixelRatio from quirksmode.
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More about devicePixelRatio from quirksmode.
Source
@DomName('Window.devicePixelRatio')
@DocsEditable()
// http://www.quirksmode.org/blog/archives/2012/06/devicepixelrati.html
@Experimental() // non-standard
num get devicePixelRatio => _blink.BlinkWindow.instance.devicePixelRatio_Getter_(this);