select2/docs/_includes/options-new/selections/placeholder.html

<section>
  <h2 id="placeholder">
    How can I have Select2 display a placeholder?
  </h2>
  
  <h3>
    My first option is being displayed instead of my placeholder
  </h3>
  
  <h3>
    I am using AJAX, can I still show a placeholder?
  </h3>
  
  <h3>
    Can I use a placeholder without a blank value?
  </h3>
  
  <h3>
    Can I change how the placeholder looks?
  </h3>
  
  <h3>
    My placeholders aren&apos;t being displayed in Internet Explorer
  </h3>
  
  <p>
    You need to include Placeholders.js on your page, or use the full build.
  </p>
</section>