html
<textarea id="go"></textarea>
css
html, body { margin: 0; padding: 0; width: 100%; height: 100%; } #go { width: 100%; height: 360px; background: yellow; border: none; margin: 0; padding: 0; }
javascript
let go = document.getElementById("go"); let a = 3; for (i = 0; i < a; i++) { go.innerHTML += i; }