I can edit questions and answers completely anonymously in the front-end.
I found an answer where a code example was missing a closing curely bracket. I decided to edit the answer and add the missing curly brace to help save a newbie some potential frustrations. However, I quickly found out that Stack Overflow requires a six-character minimum to allow edits. I felt like that was BS, so I reacted a bit emotionally and decided to bypass the requirement by adding an invisible diacritic unicode character to meet the quota. At first I thought my bypass failed because I didn't show up in the edit history. But, the closing curly bracket was there.
I went to the first page of questions and tried to edit the first question I saw. The question used the term 'z axis' so I changed it to 'z-axis' since I felt like that was a non-destructive way to test the bug I found. So, I added the hyphen and my 6 diacritics and successfully edited the question