JSFiddle - React, Tailwind, and code Playground

JavaScript

try {
    (function () {
        if (window.addEventListener) {
            window.addEventListener('load', someFunction, false);
        } else if (window.attachEvent) {
            window.attachEvent('onload', someFunction);
        }

        function someFunction() {
            alert('Execute!');
        }
    })();
} catch (e) {
    alert(e);
}