Control characters blocked by many browsers

[jgharston]

Still investigating how to let control characters typed by the user get through to the emulation. Most browsers block this and redirect the keypress to browser functions, resulting in such madness as even BACKSPACE being unusable. So far, SeaMonkey passes everything through. Android doesn't even pop up a soft keyboard, so can't even enter anything at all. Soft keyboard doesn't have a CTRL modifier key or ESCAPE key, so unsure how to even get any functionality without using an external keyboard.