A new PNG spec

Not backwards compatible. We just add it to that nice cupboard "great advanced image formats we will forget about".

Society doesn't need a new image format. I'd wager to say not any new multimedia format. Big corporate entites do, and have churning them out at a steady pace.

Look at poor webp - a format pushed by the largest industry players - and the abysmal everyday use it gets, and the hate it generates.

> and the abysmal everyday use it gets

Estimates are that 95% of Internet users have a browser that supports WebP and that ~25% of the top million websites serve WebP images. I wouldn't call that abysmal.

5% of people can't view them, yet 25% of top websites use them?

In what other industry would it be considered acceptable to exclude 5% of visitors/users/clients?

> 5% of people can't view them, yet 25% of top websites use them?

That's not how it works.

The server declares what versions of media it has, and the client requests a supported media format. The same trick have been used for audio and video for ages too.

Example:

    <picture>
        <source srcset="a.webp" type="image/webp">
        <img src="fallback.jpg">
    </picture>

This problem was solved by HTTP since forever. Client sends `Accept` header with supported formats and server selects the necessary content with corresponding `Content-Type` header. You don't need any HTML tags for it.

What about file extensions?