Web Compatibility Support • Re: :focus-within issue

I'm not sure where this would be coming from other than one of your extensions perhaps? Because there is no "i" icon in the Pale Moon page. "Singlefile" also seems to add some arbitrary code to the pages which I'm not sure about (utilising shadow DOM and explicitly hiding images with a data: URL...). Kinda sus.

EDIT: confirmed the "i" is something singlefile adds in a shadow DOM node. Since there is no z-index set outside of the shadow DOM node, it will end up behind the RSS image element. That is per spec. it doesn't matter if they set a z-index super high inside the node because the embedding document doesn't care. so, in short, it's there but it's not visible -- although there seems to be more of a problem with the node being 0-sized, so... it probably just doesn't work, period.