As I write up explanations and annotations for my poems, I find myself wanting to use lines and shapes to pick out particular areas of each work.
Here's a rudimentary prototype, drawing heavily on the LeaderLine library. Try clicking or hovering one of the bracketed sections.
I'm a fake poem, sure to spin A top around its bottom
I am a fine explanation! And I am his lovable pal.
I'm not currently planning to turn my annotations into sidenotes or marginalia, but I'll certainly draw inspiration from the numerous attempts at that style of web design. I'll also be investigating annotation platforms like Hypothesis, which may have something to offer.