[wp-trac] [WordPress Trac] #53232: Add async decoding attribute as default to the HTML image tags generated by WordPress

[WordPress Trac]

#53232: Add async decoding attribute as default to the HTML image tags generated by
WordPress
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 Reporter:  isaumya          |       Owner:  (none)
     Type:  feature request  |      Status:  new
 Priority:  normal           |   Milestone:  5.9
Component:  Media            |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |     Focuses:  performance
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Comment (by westonruter):

 @isaumya That's a good question. First of all, Priority Hints aren't yet
 standardized (see [https://wicg.github.io/priority-hints/ draft spec] and
 [https://www.chromestatus.com/feature/5273474901737472 Chrome Platform
 status]) so I think it's a bit premature to add the the `importance`
 attribute to non-lazy images; it's only supported by Chrome and not any
 other browsers.

 But secondly, I think adding `importance` should probably be the domain of
 themes (or FSE blocks) which can know for sure whether an image is in the
 first viewport and it is an important image. It's one thing to omit the
 `loading=lazy` attribute to let the browser decide whether to lazy-load,
 but it's another thing to add the `importance=high` attribute to tell the
 browser to ''PLEASE DOWNLOAD THIS NOW'' when we actually aren't 100%
 certain based on our heuristics for whether it will be in the first
 viewport.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53232#comment:20>
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