Question

Use pattern attribute in <input> and see the Output.

Answer 1

<form action="/submit-data">
  <label for="code">Country Code:</label>
  <input 
    type="text" 
    id="code" 
    name="code" 
    pattern="[A-Za-z]{3}" 
    title="Must be exactly 3 letters (e.g., IND, USA)"
    required
  >
  <button type="submit">Submit</button>
</form>

Output: