When you say "vanilla JS", do you mean "just JS with other JS-only libs for special controls, etc.", or "just JS". Because, if the latter is the case, then the

When you say "vanilla JS", do you mean "just JS with other JS-only libs for special controls, etc.", or "just JS". Because, if the latter is the case, then the challenge is easy: Virtual list controls that need to manage thousands of items/rows. Hint: you're going to need a custom scroll bar.