Portable Network Graphics (PNG) Specification (Third Edition) is now a W3C Recommendation

This document describes PNG, an extensible file format for the lossless, portable, well-compressed storage of static and animated raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF.

The Third Edition adds Animated PNG and High Dynamic Range (HDR) PNG.
https://www.w3.org/news/2025/portable-network-graphics-png-specification-third-edition-is-now-a-w3c-recommendation/