TYPO3 Core

Also doesn't work in IE7

still not working in typo3 4.5.2

I think you know the archtecture better, but anyway, here is a short debugging scenario T3 4.5.2 with IE8:

[1] BREAK AT: t3editor.js,130: [required to catch „keyup“]
CODE IS: $(that.outerdiv).fire('t3editor:keyup', {t3editor: that, actualEvent: event});
at this point: event.type is "keyup". [OK]

[2] PROCEED, STEP INSIDE, UNTIL: prototype.js,4054:
at this point:
memo is valid(?), and
memo.actualEvent.keyCode is valid (none-zero) (type is "keyup"). [OK]

[3] PROCEED, UNTIL: prototype.js,4073:
CODE IS: element.fireEvent(event.eventType, event);
at this point:
event is initialized (correct?),
event.eventType is "ondataavailable",
event.memo and event.memo.actualEvent is valid,
event.memo.actualEvent.keyCode is valid (none-zero) (type is "keyup"). [OK]

[4] PROCEED, STEP INSIDE: prototype.js,3961:
at this point:
event and event.memo.actualEvent are invalid (!?),
event.eventType is "ondataavailable", and
event.memo.actualEvent.type is "dataavailable",
event.memo.actualEvent.keyCode is 0. [WRONG?]

More steps are involved, not shown here, but with [4]:
„event.memo.actualEvent“ seems to be intentionally consumed or mistakenly overwritten during event propagation. The dot „.“ (keyCode 190) is displayed, but gone lost, so no code completion takes place.
What's going on?

It's not working on current master either (in IE11) just getting a white page with a cursor and typing stuff works but is not visible (text color white on white background).