[wp-trac] [WordPress Trac] #56529: Add minimal JPEG fallback script to address limited lack of WebP support

[WordPress Trac]

#56529: Add minimal JPEG fallback script to address limited lack of WebP support
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 Reporter:  flixos90     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  6.1
Component:  Media        |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 As noted in the original ticket #55443, there is still a very small global
 percentage of browser usage (between 1% and 3%) where the browser does not
 support WebP. Most of that is comprised of Safari on certain outdated
 versions of Mac OS and iOS.

 A pull request for this has been already in the works for the previously
 envisioned multi MIME type infrastructure (see e.g.
 https://core.trac.wordpress.org/ticket/55443#comment:115), and while this
 infrastructure has been reverted, most of the code for the fallback script
 is still relevant, so the PR can probably be continued and only has to be
 adjusted to the new circumstances where every image size has either WebP
 or JPEG available.

 The new approach here for the fallback needs to be as follows (when WebP
 is not supported): Choose the smallest available version of the image that
 has at least as large dimensions as the WebP version and has the same
 aspect ratio.

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Ticket URL: <https://core.trac.wordpress.org/ticket/56529>
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