[Pelam]

At the end of this comment there is what I believe is a single grapheme cluster. On disk this single "letter" occupies 73 bytes. Surprisingly large number of tools and editors know how to work with things like these and render them at least somehow

I think I once created one that was about a kilobyte. Is there an upper limit?

I created it using this page https://glitchtextgenerator.com/

The 73 byte X:

x̧̡̬̘͓̖̲̻̻̲̠̪̻͓͙̜̂̓̊̔̀̀͗̑̀̅̀̂̚͘̕̚͘͢͜͠