dictionary EventModifierInit : UIEventInit {
    boolean ctrlKey = false;
    boolean shiftKey = false;
    boolean altKey = false;
    boolean metaKey = false;

    boolean modifierAltGraph = false;
    boolean modifierCapsLock = false;
    boolean modifierFn = false;
    boolean modifierFnLock = false;
    boolean modifierHyper = false;
    boolean modifierNumLock = false;
    boolean modifierScrollLock = false;
    boolean modifierSuper = false;
    boolean modifierSymbol = false;
    boolean modifierSymbolLock = false;
};
