Since WebP image format supports alpha channel (transparency) and has a significant advantage over JPEG, GIF and PNG formats regarding reduced file size at a comparable image quality, supporting it should be a “no-brainer”.
Yet, Apple is consistently ignoring this superior image format – presumably, just because it is developed by Google. It is so reminiscent of Microsoft ca year 2000 refusing to adopt web standards in Internet Explorer. Are they working on developing their own web image platform?
I just revisited a Smashing Magazine article from last year, dealing with this issue.
There are interesting comments to that article, as well. Especially the ones presenting snippets of code that enable a fallback to JPEG format. I know that Will offers a single image stack that supports WebP, but I wonder if this could be implemented in RW’s galleries (@Jannis @willwood @nickcates)? [Does Nick Cates have an account on this forum?]
Anyway, I went to Apple’s Safari feedback page (https://www.apple.com/feedback/safari.html) and requested implementing WebP’s support. I am not holding my breath, though.