JSFiddle - React, Tailwind, and code Playground

HTML

<fieldset id="color">
   <input type="text" name="1">
   <input type="text" name="2">
   <input type="text" name="3">
</fieldset>
<input type="text" name="4">
<input type="text" name="5">

JavaScript

let input = document.querySelectorAll('#color input')
alert(input.length);