JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://www.polymer-project.org/platform.js?20140828"></script>
<button>button</button>

CSS

.tooltip {
    display: none;
}

JavaScript

div = $('<div class="tooltip"/>').appendTo('body');
$('button').mouseover(function () {
    div.show();
});