Inline editing is underrated. Being able to see mistakes instantly cuts down a lot of the trial‑and‑error debugging in Markdown-heavy projects.

What does debugging Markdown even mean?

What is a Markdown-heavy project?

Is this a generated comment?

For math.stackexchange.com which uses MathJax, I use MacDown, a markdown editor with parallel windows, one showing the MathJax and the other (in real time) the rendered math. I find it essential.

I enter my math directly into the editor without writing anything on paper. Works for me. The ability to copy and paste is invaluable.