JSFiddle - React, Tailwind, and code Playground

HTML

<style>
h1{background:#FF0000}
table{background:#FFCC00}
</style>

<h1>Heading</h1>

<table style="width:300px">
<tr>
  <td>Teste</td>
</tr>
</table>

JavaScript

$( document ).ready(function(){
	$( 'table' ).width( $( 'h1' ).width() )
});