[wp-trac] [WordPress Trac] #55443: Create WebP sub-sizes and use for output

[WordPress Trac]

#55443: Create WebP sub-sizes and use for output
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 Reporter:  adamsilverstein                      |       Owner:
                                                 |  adamsilverstein
     Type:  enhancement                          |      Status:  assigned
 Priority:  normal                               |   Milestone:  6.1
Component:  Media                                |     Version:  6.0
 Severity:  normal                               |  Resolution:
 Keywords:  has-unit-tests needs-dev-note        |     Focuses:
  needs-docs needs-user-docs 2nd-opinion needs-  |  performance
  testing changes-requested                      |
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Comment (by jb510):

 Replying to [comment:150 adamsilverstein]:
 > > Also, I wasn't able to find a link to the specific usage data on this,
 partially since Big Sur is lumped in with Catalina for usage. Is there a
 reference available for the ~2% falling into this category?
 >
 > @costdev I believe this is a rough calculation based on caniuse data
 combined with data like https://gs.statcounter.com/macos-version-market-
 share/desktop/worldwide. I'm not sure we can get an accurate accounting of
 this, in part because of bugs around the OS reporting the version. 2%
 globally is probably too high, given Safari's market share and the percent
 of Safari users this effects.

 I agree we'll never get exact numbers on some of these because the data is
 combined.

 What we can say is based on https://caniuse.com/webp
 IOS 3.2-13.7 Mobile Safari/Chrome 1.14%
 1.14% matters some.

 macOS < 11 Safari is some fraction of the 2.68% using Safari.
 Based on https://gs.statcounter.com/macos-version-market-
 share/desktop/worldwide 10.10 is 1.18%.  So take a wild guess what
 fraction of that 1.18% is ALSO using safari and not chrome.  We don't
 know.  A best guess would be browser usage on per 10.11 is the same ratio
 as after 10.11.  So 2.68% of 1.18%, which would be 0.03%. It's hard to
 guess if these legacy Macos users skew more towards using Safari, or
 towards Chrome.  Hypothetically even if they skwed towards safari 2:1,
 that's still insignificant.

 Conclusion - What are we doing about the 1.14% of users on iOS 13.7 or
 earlier? Are we werving them broken webp images? are we serving them
 oversized jpeg images?  Something else?

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Ticket URL: <https://core.trac.wordpress.org/ticket/55443#comment:160>
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