Currently, Quarto does not support Pandoc arguments that affect the reader format. This prevents the use of other markdown variants as input formats. 

As an example, these currently don't work:

```
reader: commonmark_x
```

```
from: commonmark_x
```

```
pandoc_args: ['-f commonmark_x+hard_line_breaks+lists_without_preceding_blankline']
```

Would it be possible to change this in the future to allow the use of `commonmark_x`?

_Originally posted by @bcdavasconcelos in https://github.com/quarto-dev/quarto-cli/issues/4905#issuecomment-1530001238_
            
cscheid
2023-05-01T20:16:27Z
bcdavasconcelos
bug
closed
`commonmark_x` as input format for Quarto
https://github.com/quarto-dev/quarto-cli/issues/5377