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Re:Why is Firefox still not supporting .webp? by gcp on Wednesday November 23, 2016 @10:57AM (#13023456)
webp can do lossless with alpha channel

So can PNG. WebP doesn't add anything new here.

It also improves on jpeg

Debunked in the post you're replying to. The difference disappears when the JPEG encoder is updated (in a backwards compatible manner!) with modern encoding techniques the WebP encoder also uses, instead of ones dating back to 1998...

Re:Why is Firefox still not supporting .webp? by markdog12 on Wednesday November 23, 2016 @11:25AM (#13023672)
So can PNG. WebP doesn't add anything new here.

Webp compresses to much smaller file sizes than PNG in lossless mode.

Debunked in the post you're replying to

Sorry, which post?