on-loading</code>
are not included here, Since <code>about</code> is the common parent for <code>index</code> and <code>slow-model</code>. This means we'll need to handle loading at every level
within the route hierarchy where loading feedback is important.</p>
</section>
<h3 id="toc_the-loading-event">The <code>loading</code> event <a href="#toc_the-loading-event"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
        <path d="M326.61 185.4c59.75 59.8 58.93 155.69.36 214.58-.1.12-.24.25-.36