WebP seems pretty widely supported to me - on Windows at least, Explorer shows thumbnails for them, Paint can open them, other editors like Paint.NET have built-in support... I haven't come across software that doesn't support WebP for a while.
There is a workaround for using SVG in Google Slides by using Google Drive to convert to EMF (a format I’ve never heard of anywhere else). It’s a pain, though.
It seems so strange to me that it is this hard to add: I wrote a userscript recently to extract titles from slides and if I recall Google slides already renders in an svg format. Wondering what's going on here.
Yep, on Gnome we have both eog and GIMP that support webp completely, and have for many years. I don't think I've even tried with other apps but haven't needed to. I didn't even realize this was a problem for some platforms
