JSFiddle - React, Tailwind, and code Playground

HTML

<div>hello dfgfhdhdgh fgdh fdghf gfdh fdgh hello1gfhd gh gh dfghd dfgh dhgf gf g dgh hello2</div>

CSS

div{width:100px;line-height:20px;}

JavaScript

console.log(document.getElementsByTagName('div')[0].offsetHeight/20);