Quarto not identifying wrong YAML options

[dense-set]

Description

(Not sure if this is a (even a?) bug of Quarto or something else, hence asking in Q&A.)

I am learning to use Quarto. Playing around, I discovered that passing wrong arguments to the header YAML sometimes gets undetected and the file still renders. For instance, with highlight-style: bad123, the following still renders:

---
title: test
highlight-style: bad123
jupyter: python3
---

```{python}
import numpy as np

a = np.arange(15).reshape(3, 5)
a.shape
```

However, if I mess up the argument of jupyter, I get greeted with an error.

Why is so? Is this expected behaviour?

[mcanouil]

highlight-style accepts custom style which can have anything as name, see https://quarto.org/docs/output-formats/html-code.html#custom-highlighting.

[dense-set]

Even if a .theme file, or any file of the provided name, is not found (in the project directory)?

[mcanouil]

I opened an issue to improve this as Pandoc does error out if when a file, it's not ending with .theme.
See #5881.
Thanks for the report.
Closing this thread.