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JavaScript

//Shift+Option+Command+LeftClick

//Shift Firefox, Safari, Chrome, Opera keyCode: 16
//Option Firefox, Safari, Chrome, Opera keyCode: 18
//Command Firefox keyCode: 224
//Command Chrome, Safari keyCode: 91
//Command Opera keyCode: 17

var isOption = false;
var isCommand = false;
var isLeftClick = false;

$(document).on('keyup', function(e){
    if(e.which == 91 || e.which == 224 || e.which == 17) isCommand = false;
    if(e.which == 18) isOption = false;
});
     
$(document).on('click', function(e){
    isLeftClick = true;
});

$(document).on('keyup', function(e){
    if(e.which == 91 || e.which == 224 || e.which == 17) isCommand = true;
    if(e.which == 18) isOption = true;
    if(e.which == 16 && isOption && isCommand && isLeftClick) {
       alert('Shift+Option+Command+LeftClick invoked!');
       e.preventDefault();
    }
});