This is the best summary I could come up with:

The process began last year by gathering proposals for web technologies that group members will try to harmonize using automated tests.

The goal is to ensure browser implementations of these technologies match specifications in order to make the web platform better for developers.

Mozilla has not jumped on the JPEG XL bandwagon either: The Firefox maker said it's neutral with regard to the technology, citing cost and lack of significant differentiation from other image codecs.

"Overall, we don't see JPEG-XL performing enough better than its closest competitors (like AVIF) to justify addition on that basis alone," said Martin Thomson, distinguished engineer at Mozilla, last year.

And it has since resisted entreaties to reconsider – despite Apple's endorsement last year and recent support from Samsung and apparent interest from Microsoft.

"Chrome is 'against' because of 'insufficient ecosystem interest' and because they want to promote improvements in existing codecs," said Sneyers, pointing to JPEG, WebP, and AVIF.

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