+ web => {
+ name => 'browser support',
+ score => {
+ jpeg => [5, undef, 'ubiquitous since first inline images (1993)'],
+ pnm => [1, undef, 'rarely by (unix) systems'],
+ xbm => [2, undef, 'common before 200X'],
+ gif => [5, undef, 'predates the web, but unrestricted since 2004'],
+ png => [5, undef, 'problematic prior to IE7, currently ubiquitous'],
+ jp2k => [2, undef, 'just Safari'],
+ webp => [4, undef, 'widespread since 2020'],
+ heic => [1, undef, 'no browser support'],
+ avif => [3, undef, 'significant since 2021 (Safari 2023, no Edge yet)'],
+ jxl => [2, undef, 'experimental, blocked by chrome'],
+ },
+ },