On some websites, there is stuff on there you are working on that isn’t saved. When you exit the app to do something else for a bit, when you go back, you do not have the SO MUCH work you have done. This is upsetting.
Create and save your written work, using that text editor (if you like that app). And when you approve of your final work, then paste it into whatever is the appropriate field of a web page.
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For Windows OS users, I suggest EditPad Lite / EditPad Pro