window.addEventListener('keydown', onKeyDown, false);
document.querySelector('#test').addEventListener('click', onButtonClick, false);


function onKeyDown(e){
    console.log("onKeyDown...");
}

function onButtonClick(){
    trigger(window, 'click');
}


function trigger(el, eventName, data){
    data = typeof data === 'undefined' ? {} : data;

    // Native
    if (window.CustomEvent) {
        const event = new CustomEvent(eventName, {detail: data});
    }
    else{
        const event = document.createEvent('CustomEvent');
        event.initCustomEvent(eventName, true, true, data);
    }

    el.dispatchEvent(event);
}