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Re:Show HN: ~200 byte in-browser, no JS, private notepad by Maybestring on Saturday May 05, 2018 @10:17PM (#17004949)
While the page doesn't use js, it is there for you to use.

document.body.innerText += 'hello world/n';

Re:Show HN: ~200 byte in-browser, no JS, private notepad by hexane360 on Saturday May 05, 2018 @10:56PM (#17005034)

    echo hello world >> file_in_notepad.txt
Although I'll admit that notepad's not as graceful about multiple programs editing files.