JSFiddle - React, Tailwind, and code Playground

HTML

<button id="show_button">Mostrar</button>

JavaScript

document.querySelector('#show_button').addEventListener('click', function() {
    if (window.webkitNotifications.checkPermission() == 0) {
        // 0 is PERMISSION_ALLOWED
        // function defined in step 2
        var notification = window.webkitNotifications.createNotification(
            'http://www.gravatar.com/avatar/b209e81c82e45437da92af24ddc97360?s=128&d=identicon&r=PG', 'Notification Title', 'Notification content...');
        notification.show();
    } else {
        window.webkitNotifications.requestPermission();
    }
}, false);