Re: revealjs background and self contained not working anymore

[John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org>]

Not sure what is happening here, but yes, an issue on the tracker
would be welcome.

I note also that because the data-background-image attribute
is retained on the h1 element as well as being propagated to
the section element, we get two copies of the encoded image.
That is bad.  See also https://github.com/jgm/pandoc/issues/5965


christophe dervieux <christophe.dervieux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Hello, 
>
> Here is a reproducible example of the issue
>
> curl --output background.jpg -L 'https://unsplash.com/photos/8OyKWQgBsKQ/download?force=true&w=1920'
>
> echo "# Slide {data-background-image='background.jpg'}" > slide.md
> echo "" >> slide.md
> echo "Content" >> slide.md
>
> # Not self contained 
> pandoc -t revealjs -s -o slide.html --metadata title="test" slide.md
>
> # Self contained
> pandoc -t revealjs --self-contained -o slide-self-contained.html --metadata title="test" slide.md
>
> When using self-contained, the background image is no more working. Pandoc 
> encodes to data: but it seems reveal.js does not know how to handle it. It 
> split the encoded data: in two url component.
>
> It seems like a change in reveal 4 as using the same slide.md file with 
> different version seems to break. 
>
> What I tried: 
>
>    - Pandoc 2.9.2.1 : last one compatible with reveal.js 3 I believe
>    
>     pandoc.exe -t revealjs --self-contained -o slide-self-contained.html --metadata title="test" -V revealjs-url=https://unpkg.com/reveal.js@3/ slide.md
>    
>    Works as expected 
>    - Pandoc 2.10: First to use reveal.js 4
>    
>      pandoc.exe -t revealjs --self-contained -o slide-self-contained.html --metadata title="test" -V revealjs-url=https://unpkg.com/reveal.js@4/ slide.md
>    
>    
> So it seems that something broke when upgrading. 
>
> Is this a known issue ?
> Should I open an issue in Pandoc to track ? I believe this could be 
> something in reveal.js not handling correctly encoded data: field.
>
> MANUAL still says (
> https://pandoc.org/MANUAL.html#background-in-reveal.js-and-beamer)
>
> Background images can be added to self-contained reveal.js slideshows and 
> to beamer slideshows.
>
> But maybe self-contained and revealjs does not work well. 
>
> Thank you
> ​
>
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