WuMDE

In this edition, the editor can render the text correctly.
Therefore, maybe you can have a try by this editor to edit markdown.

WuMDE

user can save editing file while closing

WuMDE

Wu's MDE

This is the first test, and the cs50X's final project

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You can use this software to edit some simple markdown file.
Of course, I have to say that I used a third-party markdown interpreter, so there was a problem with the rendering, but I had no way to fix it.