What does this format do in CSS: p[class|=abc]? <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>