title: What does the "+" (plus sign) CSS selector mean?
body: <p>For example:</p>
  
  <pre><code>p + p {
    /* Some declarations */
  }
  </code></pre>
  
  <p>I don't know what the <code>+</code> means. What's the difference between this and just defining a style for <code>p</code> without <code>+ p</code>?</p>