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Now in 2024 this format (AVIF) is supported in the latest versions of every popular web browser because Microsoft's support landed in Microsoft Edge 121 (January 25, so four months ago).


The first PHP version to support AVIF in GD was PHP 8.2 (released in December 2022) — prior to that PHP's GD lacked AVIF support in their getimagesize() function.


Notice that PHP 8.2 is already the recommended (though not required) version of PHP in the current set of XenForo's requirements and thus the necessary level of server-side AVIF support is already recommended.


A yesterday's screenshot of https://caniuse.com/avif is attached below:



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