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It seems to be working fine across browsers & devices. Chart elements may look blur on changing the zoom level within the display setting of browser or windows. Resetting zoom level to 100% should work fine in this case. CanvasJS Charts supports retina / HiDPI display since v1.3.
If you are still facing the issue even after resetting the zoom level in the browser and windows, kindly create JSFiddle reproducing the issue and share it with us so that we can look into the issue and resolve it.