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<!DOCTYPE html>
<html>
<body>
<h2>Telephone Field</h2>
<p>The <strong>input type="tel"</strong> is used for input fields that should contain a telephone number:</p>
<form action="/action_page.php">
  <label for="phone">Enter a phone number:</label><br><br>
  <input type="tel" id="phone" name="phone" placeholder="123-45-678" pattern="[0-9]{3}-[0-9]{2}-[0-9]{3}" required><br><br>
  <small>Format: 123-45-678</small><br><br>
  <input type="submit" value="Submit">
</form>
</body>
</html>