Some feature likes hackmd, and some other feature for more convient

Summary

1. Use numerical value to set image size.
2. Some ":::" feature such that :::info ::: or :::dager :::
3. And line between blocks.
4. Split view and tool bar.

Problem it solves

I think numerical value is more accurate than size by hand, and ":::" can make the file more colorful and easy to read. When I have blocks of Katex or Program, I would have trouble in adding new line because of the blocks. Look better and more choice.

Proposed solution

image = xxx x

:::info this is a info :::

maybe use a tag for adding new line between blocks.

have a tool bar for some feature like columns, bold, and toggle the split view or real-time show.

If anything that I described not clearly, I apologize . Also, I have google the split feature "source code mode", but it doesn't show on right side.