| type | KeyEventType | The type of keyboard event |

| modifiers | KeyEventFlags | Bit flags describing any pressed modifier keys |

| windows_key_code | int | The Windows key code for the key event. This value is used by the DOM specification. Sometimes it comes directly from the event (i.e. on Windows) and sometimes it's determined using a mapping function. See "chromium/KeyboardCodes.h" for a list of values. |

| is_system_key | bool | Indicates whether the event is considered a "system key" event. For Windows see [WM_SYSKEYDOWN](http://msdn.microsoft.com/en-us/library/ms646286.aspx). This value will always be false on non-Windows platforms. |

| character | wchar_t or unsigned short | The character generated by the keystroke |

| unmodified_character | wchar_t or unsigned short | Same as 'character' but unmodified by any concurrently-held modifiers (except shift). This is useful for working out shortcut keys. |