I'm a big fan of sidenotes as a solution for this. If you're on desktop they'll pop out to the side and it's easy enough to glance over at them or stay focused on the main text without having to navigate around. On mobile that obviously doesn't work, but instead you can just have them open inline, so you don't have to deal with the annoying anchor link jump behavior and remembering where you were. And it's all doable with CSS and float, no Javascript!

Here's an example with a fair number of sidenotes:

https://blog.alexbeals.com/posts/possession