JSFiddle - React, Tailwind, and code Playground

HTML

<body> <span hidden>H</span>	 <span>V</span>
 <span hidden>H</span>
 <span>V</span>

</body>

CSS

body {
    font-family: monospace;
}

JavaScript

$(function () {
    var elems = document.getElementsByTagName('span');

    for (var i = 0; i < elems.length; i++) {
        elems[i].hidden = !elems[i].hidden;
    }
});