In Esperanto, it is common to type gx or cx to mean the single letter g(with the hat) and c(with the hat). There is also a system of using an h instead of an x (like gh and ch to mean the single special letters). (https://en.wikipedia.org/wiki/Esperanto_orthography#ASCII_transliteration_systems)
In the course via the web page, as far as I can tell you must use the mouse to click the on-screen letters. That is very inconvenient because it breaks an otherwise effortless input mode (typing with the keyboard).
Has anyone found another method?
If it's useful, I just made a Chrome Extension that turns x-system into accented characters as you type. You can find it here: https://chrome.google.com/webstore/detail/esperaboard-esperanto-x-s/nkgbomaneihlabdhjihdhpdlehahahoc?hl=en.