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When copying text from a website to your device’s clipboard, there’s a good chance that you will get the formatted HTML when pasting it. Some apps and operating systems have a “Paste Special” feature that will strip those tags out for you to maintain the current style, but what do you do if that’s unavailable?
Same goes for converting plain text into formatted HTML. One of the closest ways we can convert plain text into HTML is writing in Markdown as an abstraction. You may have seen examples of this in many comment forms in articles just like this one. Write the comment in Markdown and it is parsed as HTML.
Even better would be no abstraction at all! You may have also seen (and used) a number of online tools that take plainly written text and convert it into formatted HTML. The UI makes the conversion and previews the formatted result in real time.