To test manually, press keys and compare results to other browsers.

  
target - type - ctrlKey,altKey,shiftKey,metaKey - keyIdentifier - keyCode - charCode
Space:
INPUT - keydown - false,false,false,false - U+0020 - 32 - 0. Value: "".
INPUT - keypress - false,false,false,false - - 32 - 32. Value: "".
INPUT - textInput - . Value: "".
INPUT - keyup - false,false,false,false - U+0020 - 32 - 0. Value: " ".
Backspace:
INPUT - keydown - false,false,false,false - U+0008 - 8 - 0. Value: " ".
INPUT - keyup - false,false,false,false - U+0008 - 8 - 0. Value: "".
Left Arrow:
INPUT - keydown - false,false,false,false - Left - 37 - 0. Value: "".
INPUT - keyup - false,false,false,false - Left - 37 - 0. Value: "".
Tab:
INPUT - keydown - false,false,false,false - U+0009 - 9 - 0. Value: "".