JSFiddle - React, Tailwind, and code Playground

HTML

<div id="teste"></div>

JavaScript

var atual = document.getElementById('teste');
atual.addEventListener('mouseover', function () {
    alert('HUE HUE HUE BR');
});

function createFakeMouseEvent(event, elemento) {

    var evt;
    if (!(window.mozInnerScreenX == null)) {
        // Firefox
        evt = document.createEvent("MouseEvents");
        evt.initMouseEvent(event, true, true, window, 120, 0, 0, 0, 0, 0, 0, 0, 0, 0, null);
        elemento.dispatchEvent(evt);
    } else {

        if ('onwheel' in document) {
            // Chrome, PhantomJS, Safari
            evt = document.createEvent("MouseEvents");
            evt.initMouseEvent(event, 0, 100, window, 0, 0, 0, 0, null, null, null, null);
            elemento.dispatchEvent(evt);
        } else if ( !! document.createEvent) {
            // IE9
            evt = document.createEvent("HTMLEvents");
            evt.initEvent(event, true, false);
            elemento.dispatchEvent(evt);
        } else if (document.documentMode == 9) {
            // IE10+, Safari
            var evt = document.createEvent("MouseEvents");
            evt.initEvent(event, true, true);
            elemento.dispatchEvent(evt);
        } else {
            // IE8
            var evt = document.createEventObject();
            elemento.fireEvent(event, evt);
        }
    }
}
createFakeMouseEvent('mouseover', atual);