I'm following the advice here :
https://docs.cypress.io/api/commands/viewport.html#devicePixelRatio

Current behavior:

Actually we can't simulate pixelRatio/pixelDensity with Cypress.
It can be very useful for testing correct behavior around responsive images.

Desired behavior:

Have the possibility to switch the DevicePixelRatio in cypress.

Viewport dimension changes and testing the currentSrc is already very useful.
Having DevicePixelRatio in cypress would enable finer tests.

Test code to reproduce

Not applicable as it's not implemented.

It could be another option to cy.viewport()