Look at rust-lang/rfcs#2544

Scroll down the the "Load more ..." (below "NNN hidden items" for some NNN).

The link there only loads some of the comments. It would be great to have a way to load all of them (e.g. it would help for people who then use search to find text in the page).

(I did try Alt-click; it did not work for me in this context.)