Top-3 Most wanted features

[neSpecc]

Write a short list of the most wanted features you're missed in Editor.js. Lets find the really most wanted.

Please, be short and stay in a following format:

1. Short description (Link to a corresponded discussion if exists)
2. ...
3. ...

If you're one of our donators on OpenCollective or Patreon, please, include a link to you'r profile. We'll review your siggestion with a higher priority.

Example

1. Blocks drag'n'drop
2. Markdown support
3. Server-side rendering

[GuillaumeOnepilot]

1. Integrated History manager (undo/redo feature)
2. JSON output for inline format (would have to migrate everything on my side, but that's a sacrifice I'm willing to make)
3. Native API to handle text selection

[ats1999]

I vote for 1 and 2

[FlusherDock1]

1. Non-asynchronous way of dumping JSON content in textarea
2. Ability to get raw HTML instead of JSON
3. Option to pin always visible toolbar and block selector
4. Nesting

[lujdong]

1.Support inserting content at the cursor position.
2.Able to input and output HTML with inline styles.
3.Columns Support

[vigneshksaithal]

1. Markdown support.
2. Columns support.
3. Nesting.

[ngmiduc]

1. Collaborative editing
2. Inline commenting (Inline Comments #1956)
3. Blocks Drag and Drop

[tiagorangel2011]

1. Markdown support
2. Dark mode
3. Inline comments, AI and collaboration

[javadbat]

1. ability to choose an " _blank" target link
2. event fire when user delete or remove block
3. support web-component for writing plugin

[ats1999]

I vote for 1

[sethaddison]

1. Collaborative editing
2. Version history
3. Dark mode

[ats1999]

1. Integrated History manager (undo/redo feature)
2. JSON output for inline format (would have to migrate everything on my side, but that's a sacrifice I'm willing to make)

Related Issue -> #2568