How to format text in Android, IOS, website?

Question

HTML

Hello.
Now the task is to be able to format text (bold, italic, etc.) in the application on android, ios and the website. The main task is. so that the text saved after that could move between devices and be displayed on them in the same way (as far as possible), in any case, so that the text formatting is preserved.
Of course, for such a task, you need a markup language that is the same for everyone.
You can use html markup, but I would like to know about alternatives.
If anyone has had a similar experience please let me know what you did.
Of course, it is better if there are ready-made solutions for all platforms, so as not to assemble bicycles.

Answer 1

What's wrong with HTML?

Answer 2

Markdown