JSFiddle - React, Tailwind, and code Playground
HTML
<form action="" id="myForm">
<input type="text">
</form>
<select form="myForm" name="" id="">
<option value="1">1</option>
<option value="1">2</option>
</select>
JavaScript
document.getElementById('myForm').addEventListener('onChange', () => {
alert('form changed')
})