JSFiddle - React, Tailwind, and code Playground

by soundstep

JavaScript

var evt = document.createEvent("Event");
evt.initEvent("myEvent", true, false);

function eventHandler(e) {
    e.preventDefault();
    // returns true on opera while it shouldn't!
    alert("prevent defaulted: " + e.defaultPrevented);
}

document.body.addEventListener("myEvent", eventHandler);
document.body.dispatchEvent(evt);