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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>cols Textarea Example</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}label{display:block;margin-bottom:.35rem;font-size:.875rem;font-weight:500;color:#475569}textarea{display:block;font:inherit;max-width:100%;box-sizing:border-box;padding:.5rem .65rem;border:1px solid #cbd5e1;border-radius:6px;resize:vertical}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>cols on textarea</h1>
  <label for=msg>Your message:</label>
  <textarea id=msg cols=40 rows=5>Enter text here...</textarea>
  <p class=hint><code>cols="40"</code> sets the visible width to about 40 character columns. Pair with <code>rows</code> for height.</p>

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HTML cols Attribute — Textarea Width