title: What does this format do in CSS: p[class|=abc]?
body: <p>What does this format do in CSS:</p>
  
  <pre><code>p[class|=abc]
  </code></pre>
  
  <p>and</p>
  
  <pre><code>#pTag a[href^="https://"]
  </code></pre>
  
  <p>I'm not able to search for it as I don't know the exact terminology for this.</p>
  
  <p>Any help with some links to study on these square brackets thing would be greatly appreciated.</p>
  
  <p>Thanks in advance.</p>