In commonmark with the generic attributes extension (enabled in commonmark_x), you can put different attributes on different lines:

{.class}
{key=value oherkey=othervalue}
{more="of this"}
```
my code block
```


> On Jul 18, 2022, at 8:02 PM, A A <amine.aboufirass-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> If you have many attributes and want to keep the markdown source clean, I don't see how that can be avoided....
>
>
> On Mon, 18 Jul 2022 at 18:16, John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> It will work with pandoc's markdown parser, but not with commonmark and variants.  For maximum portability and future-proofing, you might want to avoid line breaks in attributes.
>
>
> > On Jul 18, 2022, at 5:24 PM, Sukil Etxenike arizaleta <sukiletxe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Hi,
> >
> > Yes, you can. I've tried with Pandoc 2.18 and it worked fine, except in one case where I don't know what I did.
> >
> > Hth,
> >
> > Sukil
> >
> >
>
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