I could have sworn animated pngs were a thing in the Macromedia Fireworks days. Really dating myself with that ref.

Sigh, I miss Macromedia. Anyway, I do remember that being a thing as well. Guess it was never officially part of the spec.

There were two different animated PNG extensions, MNG and APNG. Neither of them ever really caught on. I guess they're hoping to do better by baking it into the core spec.

Goodbye gif hello png?

I miss the days when all the cool websites used Flash. I think Macromedia killed it for some reason. Probably because it had security flaws, back then it was pretty bandwidth-intensive too, but it made for some dynamic web designs.

But is it backwards compatible with an old version that can't be updated?

The current situation with megabytes of JavaScript is pretty bad, but at the time, there was still a fair bit of dialup active, and mobile web was just starting to be a thing - on EDGE and barely 3G. It would take minutes to load.

Also, Steve Jobs had it in for Flash and that’s what ultimately killed it off, I think.

Probably means there will be new PNGs that old software won't be able to open.

Yeah, this was my first thought. How many slightly older, no-longer-being-updated pieces of software will fail to open the new version? Hopefully it’s built in a way that it just falls back to legacy and ignores the extra information so you can at least load the file.

APNG is what they're using in v3, so all many libraries need to do* is update that code for HDR.

* surely that's easy, right?

HDR capable PNGs that don't look shite on SDR displays? Sign me up!

Flash had a myriad of problems. Web devs celebrated its death.

Popular photo and video editing apps like Photoshop, DaVinci Resolve, and Avid Media Composer already support it, alongside Chrome, Safari, and Firefox. Apple’s iOS and macOS also work with the new file standard.

This is all the article mentions. I hope you’re right about the backwards compatibility.

It makes sense, right? Is there a way around that when adding new features to a file format?

The alternative is to make another file format for clarity, but it's not really what you want to do.

Fracturing support for a legacy format makes so much more sense than actually supporting a modern format like JXL, right?

Some of this is paving the cowpath - the animated PNG stuff is 20 years old and e.g. Firefox has had support since March 2007.

If this actually stands a chance of taking off, I'll honestly take what I can get to normalise HDR images

Yes, the iPhone did not and never has supported Flash. At least not officially from Apple. There was support, albeit not quite 100% complete, on Windows CE/PocketPC at the time, though. That was one of the things that let me lord it over early iPhone adopters back in the day — my pocket nerd computer could play Homestar Runner videos, and their stupid expensive bauble couldn't. So there.

I mean, that's already how animated .gifs work. If somehow you manage to load one into a viewer that doesn't support the animation functionality it will at least dutifully display the first frame.

How the hell you would manage to do that in this day and age escapes me, but there were a fair few years in the early '90s where you might run into that sort of thing.