Doesn't work with background images

[codecounselor]

I just started using this plugin and noticed background images don't work. I am curious what other Reveal.js features are not currently supported. I think for right now I'll just stick to a single file, but I really like the idea of this plugin!

This works in single file, doesn't work when externalized.

<section data-background-image="https://cdn.pixabay.com/photo/2017/09/22/23/57/fire-2777580_1280.jpg">
	<h2>Image Test</h2>
</section>

[janschoepke]

Thanks for this report. I will take a look at it in the future.