document.getElementById('testnone').setAttribute("style", "background-color: green"); document.getElementById('testalt').setAttribute("style", "background-color: green"); document.getElementById('testnoctrl').setAttribute("style", "background-color: green"); document.getElementById('altnoaccel').setAttribute("style", "background-color: green");

Test by clicking on the headers with mouse button 1, with the correct modifier keys pressed/active. If the modifiers work, text background turns green.

No modifier keys. Should turn green if no modifiers are pressed.

ALT pressed. Should turn green if clicked while holding down the ALT key (only).

CTRL not pressed. This should turn green if you click on it without the CONTROL key being pressed, regardless of other modifiers.

Only the system accelerator key pressed. This should turn green when clicked with ONLY the system accelerator key pressed (e.g. CTRL in Windows)