How to do a horizontal screen flip to get a reversed screen?

I've seen a few posts asking for advice on this but they aren't very clear in what they want.
I want to take whatever is on the screen, and flip it (mirror it essentially, but searching for mirroring just brings up how to cast to a screen).
That's basically it.
For example, if I have the WebViewer component set to pull up on loading, I want the text to be backwards, so it can be read in a mirror.

Is that possible?