JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://rawgit.com/lhorie/mithril.js/master/mithril.min.js"></script>
<script src="https://rawgit.com/StephanHoyer/640fa4cb29eaa9d45b78/raw/c8a6233b4dae2ae542d61e4484cce11377479d7f/tooltip.js"></script>
<div id="main"></div>

CSS

.tooltip {
    background: silver;
    color: white
}

JavaScript

var app = {
    view: function () {
        return m('.container', [
            m('div', {
                onmouseover: tooltip.show('huhu'),
                onmouseout: tooltip.hide
            }, 'hover me'),
            tooltip.view()
        ]);
    }
}
m.module(document.getElementById('main'), app);