This is definitely something in revealjs that change in version 4.1.1. It 
works ok with 4.1.0

pandoc -t revealjs --self-contained -o slide-self-contained.html --metadata title="test" -V revealjs-url=https://unpkg.com/reveal.js@4.1.0/ slide.md

​
Le mardi 28 septembre 2021 à 11:21:18 UTC+2, christophe dervieux a écrit :

> 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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