Why the keyup event is not fired on an element in JavaScript while moving the mouse with the left button held down? -

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i guess came across pretty strange (to me) situation. have "keyup" event bound div (with tabindex set, of course) contains google map. need disable map dragging functionality when shiftkey pressed down , enable again when key goes up:

            mapelement.setattribute("tabindex", 0);             mapelement.focus();             google.maps.event.adddomlistener(mapelement, "mouseover", function(e) {                 mapelement.focus();             });             google.maps.event.adddomlistener(mapelement, "mouseout", function(e) {                 mapelement.blur();             });                         google.maps.event.adddomlistener(mapelement, "keydown", function(e) {                 var isshift;                 if (window.event) {                   isshift = !!window.event.shiftkey;                 }                 else {                   isshift = !!e.shiftkey;                 }                                 if (isshift) {                                          map.setoptions({ draggable: false });                 }             });

now, in order add keyup event, following: 

google.maps.event.adddomlistener(mapelement, "keyup", function(e) {                 var isshift;                 console.log(e);                 if (window.event) {                   isshift = !!window.event.shiftkey;                 }                  else {                   isshift = !!e.shiftkey;                 }                 if (!isshift) {                                    map.setoptions({ draggable: true });                 }             });

but event not fired if following steps in order:

1) press shift key down while mouse over map (mouseover) (map dragging disabled here);

2) while holding down shift key, press left button of mouse , move cursor on map;

3) while moving cursor on map left button pressed, release shift key (which held down time) -> here expect keyup event set fired , map becomes draggable again, instead it's not...;

it works should if first release left mouse button and then raise shift key up. of, course, workaround add "mousemove" event, this:

google.maps.event.adddomlistener(mapelement, "mousemove", function(e) {                 if (!e.shiftkey) {                     map.setoptions({ draggable: true });                 }             });

but more expert me in js event handling tell me what's going on here , why keyup wasn't fired?

thanks attention!


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