The highlight does not work

Hi! I am trying to follow the documentation:

```js

hljs.registerLanguage("raku", window.hljsDefineVue);
hljs.initHighlightingOnLoad();

```

But it does not produce a desired effect, the code inside per.code is not highlighted:
```html

```
May I can take a look at working example somewhere?

Start by reproducing the documentation's JavaScript example with the shown Raku code block and compare the registration call with the documented integration. Done means identifying why the example fails and providing a verified working example or a focused correction to the documentation.

Written by the indexing model from the issue text.