JSFiddle - React, Tailwind, and code Playground

HTML

<div id="d1">
    <div id="d2">W
        <br>o
        <br>r
        <br>l
        <br>d
    </div>
    <div id="d3">Hi</div>
</div>

CSS

#d1 {
    background-color:yellow;
    position:relative;
}
#d2, #d3 {
    position:absolute;
}

JavaScript

var height = Math.max($( "#d2" ).height(),$( "#d3" ).height());
$('#d1').height(height);