[feature-request] Add webp polyfill

[ghost]

What

It would be cool if you could include a webp polyfill in your service (maybe webp-hero).

Details

I regularly use WebP to reduce my file size, but I also have to support IE11 which does not support this format. And because I really like your service and use it for other polyfills too it would be great if you could integrate one for WebP.

Additional information

WebP is an image format employing both lossy and lossless compression. It is currently developed by Google, based on technology acquired with the purchase of On2 Technologies.

[sjparkinson]

Browser polyfill for the webp image format.

• webp images come alive, even in safari and ie11! (firefox and edge now support webp)
• webp-hero actually runs google's libwebp decoder in the browser — it converts webp images to png's on-the-fly
• webp-hero's polyfill functionality renders decoded image data to a hidden canvas, and converts that to a png data url which is then displayed to the user

https://github.com/chase-moskal/webp-hero

[JakeChampion]

Hi, I don't think we will add a polyfill for webp, it is a very large polyfill and only works in some scenarios (does not work for webp images used in CSS). I would recommend using the srcset attribute on an IMG tag and serving PNG or jpeg to browsers which don't have webp support