How to handle previews of one route inside another route?

[vedantroy]

Let's say I have the route: /question/:questionId.
Now, let's say there's a different route on my page, called /questions`, which displays the title of every question.

I might want the following effect: when I hover over a question title, I want the question page to pop-up. (As a form of preview).
This is kind of similar to unpoly's layers: https://unpoly.com/tutorial (Ctrl-F "Leveraging Layers"), where you can render HTML fragments in modals.

What would be the best way to do this in Remix?