title: What does "i" mean in a CSS attribute selector?
body: <p>I have found the following CSS selector in the Google Chrome user agent stylesheet:</p>
  
  <pre><code>[type="checkbox" i]
  </code></pre>
  
  <p>What does the <code>i</code> mean?</p>
  
  <p><img src="https://i.stack.imgur.com/8D94p.png" alt=""></p>