Instances of DevicePixelRatioObserver can be registered with a DevicePixelRatioMonitor to receive callbacks for a change in the HTML window's device pixel ratio.
Called when the device pixel ratio monitor detects a change in the HTML window's device pixel ratio. This can happen if the window is dragged to a monitor with a different hi-dpi characteristics.
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Instances of DevicePixelRatioObserver can be registered with a DevicePixelRatioMonitor to receive callbacks for a change in the HTML window's device pixel ratio.