This appears to be at least somewhat browser (and possibly device and font) dependent. While I cannot reproduce this issue with your example answer in either Chrome or Firefox on my Android tablet, nor in the Firefox dev tools responsive design mode on my desktop, I can reproduce it in both Firefoxes (but not on Chrome) with this answer of mine (where the actual culprit seems to be the image, and not the code).
Anyway, one aspect of the problem that I did find the cause for is the lack of overflow. Basically, for whatever reason, the current mobile view style sheet contains the following conflicting rules (other non-conflicting styles trimmed for clarity):
.answer-summary { overflow: auto }
.answer { overflow: hidden }
Alas, because these rules have equal specificity, the latter one (i.e. overflow: hidden
) takes precedence. This is what's causing any overflowing answers to be clipped, preventing them from scrolling sideways.
A simple quick fix would be to add the following, more specific CSS rule:
.answer.answer-summary, .question.question-summary { overflow: auto }
This should at least allow you to scroll such overflowing answers sideways or zoom out to read them.
(I'd add this style to SOUP, but no mobile browsers that I know of support user scripts, so there's not much point.)