<form action="">
  <label for="fname">First name:</label><br>
  <input type="text" id="fname" name="fname" value="John" required><br>
  <label for="lname">Last name:</label><br>
  <input type="text" id="lname" name="lname" value="" required><br><br>
  <input type="submit" value="Submit">
</form>