JSFiddle - React, Tailwind, and code Playground
HTML
<input type='text' id='total'></input><input type='text' id='minus'></input><div id='final'></div>JavaScript
function calc(e){document.getElementById('total').innerHTML = parseInt(document.getElementById('total').value) - parseInt(document.getElementById('minus').value);} document.getElementById('total').addEventListener('keydown',calc);document.getElementById('minus').addEventListener('keydown',calc);