JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <br/>
</div>
<div>
    <br/>
    <br/>
</div>
<div>
    <br/>
    <br/>
    <br/>
</div>

CSS

div {
    border: 1px solid red;
    width: 33%;
    float: left;
    box-sizing: border-box;
}

JavaScript

var equalDimension = function (selector, fn) {
    var $elements = $(selector),
        dimensions = $elements.map(function (i) {
            return $elements.eq(i)[fn]();
        }),
        maxDimension = Math.max.apply(Math, dimensions);
    $elements[fn](maxDimension);
};

equalDimension('div', 'height');