[wp-trac] [WordPress Trac] #62413: WordPress 6.7 Lazy Load Issue Reducing Image Sizes

[WordPress Trac]

#62413: WordPress 6.7 Lazy Load Issue Reducing Image Sizes
-------------------------------------------------+-------------------------
 Reporter:  dooperweb                            |       Owner:  joemcgill
     Type:  defect (bug)                         |      Status:  reviewing
 Priority:  normal                               |   Milestone:  6.7.1
Component:  General                              |     Version:
 Severity:  major                                |  Resolution:
 Keywords:  reporter-feedback has-testing-info   |     Focuses:
  needs-patch                                    |  performance
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Changes (by azaozz):

 * keywords:  reporter-feedback has-testing-info => reporter-feedback has-
     testing-info needs-patch


Comment:

 This seems related to #62345. Can reproduce it with images that have
 `sizes=auto` and also have `width: fit-content;` CSS applied to them.
 Seems to happen consistently in Chromium based browsers, works fine in
 Firefox.

 Removing either `auto` from the `sizes` attribute, or `width: fit-
 content;` fixes it. This sounds like a browser bug, and hopefully will be
 fixed upstream.

 Seems a good fix for now may be to have a filter that plugins and themes
 can use to toggle adding of `auto` to the `sizes` attribute. The question
 is whether `auto` should be present by default (as now) or let it be added
 by plugins and themes when they know there's no `fit-content` on the
 images. That would probably depend on how common it is for images to have
 `width: fit-content;`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/62413#comment:13>
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