From my narrow view of the world, changing the CommonMark writer to match 
the rest here would be great!

In my real problem, the presence of this "fig:" makes image links 
vulnerable to breakage via the insertion of a hard line break at the space 
before "fig:". Therefore I have to also manipulate text wrapping, i.e. set 
--wrap=none or --wrap=preserve to protect the links.

On Friday, October 13, 2017 at 10:31:12 AM UTC-7, John MacFarlane wrote:
>
> It's a kludge we use to distinguish images that should be 
> treated as figures.  You can turn off the extension 
> entirely using 
>
>     -f markdown-implicit_figures 
>
> I can also change the CommonMark writer so that the "fig:" 
> prefix is removed, as it is in the other Markdown writers. 
>
> +++ Jennifer Bryan [Oct 13 17 09:44 ]: 
> >   Why does the title "fig:" get inserted into this image link and, more 
> >   importantly, how can I prevent that? 
> >   $ echo '![](foo.png)' | pandoc -f markdown -t commonmark 
> >   ![](foo.png "fig:") 
> >   It appears to be fairly specific to CommonMark, i.e. it's not there 
> for 
> >   other flavours of markdown. 
> >   $ echo '![](foo.png)' | pandoc -f markdown -t markdown_github 
> >   ![](foo.png) 
> > 
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