If you ever need a quick scratchpad to just write, not save what you write, but just write, you can quickly turn your web browser into an ultra-basic notepad with a single line of HTML.
This clever trick comes from developer Jose Jesus Perez Aguinaga who says that “sometimes I just need to type garbage. Just to clear out my mind. Since I live in the browser, I just open a new tab and type”
data:text/html, <html contenteditable>
Thanks to the HTML5 contenteditable attribute and the modern browser’s ability to handle data URIs, your browser is now a notepad — just click to type.