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<!DOCTYPE html> <html> <body> <form action="/action_page.php" method="get"> Name: <input type="text" oninvalid="alert('Must contain 6 or more characters');" name="fname" pattern=".{6,}"> <input type="submit" value="Submit"> </form> <p>If you submit the input field with less than 6 characters, an alert message will occur.</p> <p><strong>Note:</strong> The oninvalid event is not supported in Safari.</p> </body> </html>
