Hi. I'm seeing that background-image URLs containing any parentheses are not being displayed.

Example:

• Working example
• Failing example
• Another failing example

The failing image URL is: https://commons.m.wikimedia.org/wiki/Special:FilePath/Apatosaurus%20skeleton%20construction%20(3349699758).jpg?width=600px (and loads fine as an image in the browser or directly)

I use revealjs on my conze.pt website, where I use Wikimedia Commons images, which often contain these parentheses in the URL.