Pseudo-class :optional

The :optional CSS pseudo-class represents any
, , or element that does not have the required attribute set on it. <pre class="astro-code github-dark" style="background-color:#24292e;color:#e1e4e8; overflow-x: auto; white-space: pre-wrap; word-wrap: break-word;" tabindex="0"><code><span class="line"><span style="color:#85E89D">input</span><span style="color:#B392F0">:optional</span><span style="color:#E1E4E8"> {</span></span> <span class="line"><span style="color:#79B8FF"> border-color</span><span style="color:#E1E4E8">: </span><span style="color:#79B8FF">rebeccapurple</span><span style="color:#E1E4E8">;</span></span> <span class="line"><span style="color:#79B8FF"> border-width</span><span style="color:#E1E4E8">: </span><span style="color:#79B8FF">3</span><span style="color:#F97583">px</span><span style="color:#E1E4E8">;</span></span> <span class="line"><span style="color:#E1E4E8">}</span></span></code></pre>