devicePixelRatio / zoom rescale error

Hello, I have a bug that I don't understand.

When using chrome without zoom window.devicePixelRatio return 1 and my application is well rendered.

When I zoom out (for exemple 25%) window.devicePixelRatio return 0.25 and my application is rendered with a x4 factor.

When I zoom in (for exemple 500%) windows.devicePixelRatio return 5 and my application is rendered with a /5 factor.

(same results with firefox)

Is there a way to to reverse the factor ? When zooming-out, I want my app to reduce it's size.

To be precise, I think the zoom-in behavior work as expected because the canvas use a width and height of 100%, but the actual zoom-out behavior scale the app outside of the browser viewport