Basic Markdown and Shaku syntax are support!
<pre class="shiki github-dark shaku"><code>import { useState } from 'react';export default function Counter() { const [count, setCount] = useState(0);<div class="shaku-underline shaku-underline-wavy" style="left:16ch">~~~~~~~~</div> // This // is // Comment function handleClick() { setCount(count + 1);<div class="shaku-underline shaku-underline-solid" style="left:4ch">-------------------</div><div class="shaku-callout" style="left:4ch">Underline and callout!</div> } const blog = "https://jser.dev" console.log('jser.dev') return ( &lt;button onClick={handleClick}&gt;<div class="shaku-callout" style="left:8ch">Supports JSXAwesome,right?</div> You pressed me {count} times &lt;/button&gt; );}</code></pre>

Practical checklist for image-heavy pages (what actually moved the needle)

For loading, we can compress, choose right format, preload, lazyload or inline critical images. For perceptive performance, we could show skeleton or …