JSFiddle - React, Tailwind, and code Playground

HTML

<div id="menu">
    <div id="a">A</div>
    <div id="b">B</div>
    <div id="c">C</div>
</div>
<div id="conteudo"></div>

CSS

#menu > div {
    display: inline;
    padding: 0 20px;
    border: 1px solid black;
    cursor: pointer;
}
#conteudo > div.visivel {
    display: block;
}

JavaScript

$('#menu > div').on('click', function () {
    url = '/shmD9/show';
    var aClasse = this.id;
    $.ajax({
        url: url,
        success: function (returnhtml) {
            var tempText = (returnhtml.split('<body>'))[1].split('</body>')[0];
            var divEnscolhido = $('<div></div>').append(tempText).find('.' + aClasse);
            $('#conteudo').html(divEnscolhido);
        }
    });
});