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

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