I guess I could make the on-screen keyboard work with a text area instead of needing an external one, but I never planned on using that, I find “glass keyboards” annoying to use. It would require some serious changes to the system though, since everything is designed for reading input from a keyboard from “stdin”, so to say.

So far has survived fine, and as long as there are no major changes in the browser (long polling and the JS I use have been available for several years from what I have seen in people who investigated its features). It’s a risk I accepted when I wrote it, worst case the docs are in the Pi, and then PiWrite can be used from any web browser on any modern enough device.