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It must a pain to make a Rich Textbox
(lemmy.ml)
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There are markup languages for this purpose. And you store the rich text as normal text in that markup language. For the most part.
It's typically an XML or XML-like language, or bb-codes. MS Word for example uses XML to store the markup data for the rich text.
Simpler and more limited text needs tend to use markdown these days, like Lemmy, or most text fields on GitHub.
There's no need to include complex technology stacks into it!
Now the real hard part is the rendering engine for WYSIWYG. That's a nightmare.
Markdown has one huge adventage, if you remember bit of syntax you can type it right from your finger, it's a great speedup for me. I personally prefer orgmode but noone uses that in XXI century.
Yeah, but that's not what we're talking about here.
RTF has many more features than markdown can reasonably support, even with your personal, custom, syntaxes that no one else knows :/
I use markdown for everything, as much as possible, but in the context of creating a RTF WYSIWYG editor with non-trivial layout & styling needs it's a no go.