Implementing progressive enhancement with Ajax

Throughout this book, we encountered the concept of progressive enhancement. To reiterate, this philosophy ensures a positive user experience for all users by mandating that a working product be put in place first before additional embellishments are added for users with modern browsers.

As an example, we'll build a form that searches GitHub repositories:

<form id="ajax-form" action="https://github.com/search" method="get"> 
  <fieldset> 
    <div class="text"> 
      <label for="title">Search</label> 
      <input type="text" id="title" name="q"> 
    </div> 

    <div class="actions"> 
      <button type="submit">Request</button> 
    </div> 
  </fieldset> 
</form> 

Getting the example code
You...