Thanks! It has some cons, like worse scanability. But I think its really cool that you can have something open next to your paragraph, especially when you need to consult the popup quite often. Like, a table with a bunch of data would also be quite nice with this approach I feel.

If you have any feedback I'd love to hear it!

The way https://gwern.net/ does it is quite good.

The links open in a window, so you can still have centre aligned text with popups.

Just flip them.

i've been wanting to implement a design like this for blogs for 5 or 10 years. Great work on the inline detail on mobile. genuinely better than whatever i would have made.

did you consider pushing the word(s) directly following the activation button to below the detail pane, rather than doing it based on line break?