No styling on lists because of XSS sanitization

I'm trying to use a Pandoc extension in Gitit, but I don't know how.

More precisely, I have numbered bylaws which should be displayed with the `fancy_lists` extension.

``` md
1. First
2. Second
a. Sub-item
b. Sub-item 2
3. Third
```

A and B should conserve their letters rather than switching to numbers.

However, the exact same text, filtered with Pandoc in shell, will yield the desired rendering.
- Is this expected behavior?
- Is there a way to modify it?

I am using Gitit 0.10.3.1+p and Pandoc 1.11.1.

(As an issue, this would go towards documentation)