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<!DOCTYPE html> <html> <body> <h1>The input pattern attribute</h1> <form action="/action_page.php"> <label for="country_code">Country code:</label> <input type="text" id="country_code" name="country_code" pattern="[A-Za-z]{3}" title="Three letter country code"><br><br> <input type="submit"> </form> <p><strong>Note:</strong> The pattern attribute of the input tag is not supported in Safari 10 (or earlier).</p> </body> </html>
