How can the use of JavaScript for setting focus in the PHP script be replaced with more efficient and modern techniques for better functionality?

The use of JavaScript for setting focus in a PHP script can be replaced with more efficient and modern techniques by utilizing HTML autofocus attribute. This attribute allows you to set focus on an input element directly within the HTML code without the need for JavaScript. By using autofocus, you can achieve the same functionality in a cleaner and more streamlined manner.

<form action="process_form.php" method="post">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username" autofocus>
  
  <label for="password">Password:</label>
  <input type="password" id="password" name="password">
  
  <input type="submit" value="Submit">
</form>