<!--<h1 class="normal">Attribute (basic) selector: <code class="normal">[attr]</code></h1>-->
<a href="https://google.com"></a>
<a href="http://msn.com"></a>
<a href="https://codepen.io"></a>
[href] {
background: lavender;
}
[href="https://codepen.io"] {
border: 3px solid salmon;
}
Also see: Tab Triggers