Tags
You can use Svelte components for tags, the same way you do for nodes.
Create a Svelte file and export Svelte components with the same name as the tag from the module script.
<script module>
export { default as Multiply } from './Multiply.svelte';
</script>
import { dirname, join } from 'path';
import { fileURLToPath } from 'url';
markdoc({
tags: join(
dirname(fileURLToPath(import.meta.url)),
'./src/lib/Tags.svelte',
),
});
<script>
let { a, b } = $props();
</script>
<p>{a} * {b} = {a * b}</p>
# I am in a markdoc file
{% multiply a=2 b=3 /%}