[wp-trac] [WordPress Trac] #58235: Enhance hero image loading performance with Fetchpriority

[WordPress Trac]

#58235: Enhance hero image loading performance with Fetchpriority
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 Reporter:  flixos90     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Media        |    Version:
 Severity:  normal       |   Keywords:
  Focuses:  performance  |
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 The `fetchpriority` attribute is a standard HTML attribute that allows
 annotating resources (e.g. images, scripts, stylesheets, ...) on a web
 page to give them a certain priority.

 While the attribute can be used on different resources, this ticket is
 scoped to images only. Using the `fetchpriority` attribute is recommended
 with a value of “high” on the most important image on a page, which is an
 important performance best practice that improves [https://web.dev/lcp/
 LCP] performance.

 Please see the [https://make.wordpress.org/core/2023/05/02/proposal-for-
 enhancing-lcp-image-performance-with-fetchpriority/ proposal post] for
 additional context.

 As mentioned in the post, support for `fetchpriority` on images should be
 implemented relying on similar logic as lazy-loading images uses. Yet, the
 two attributes need to function on their own, e.g. even sites that disable
 lazy-loading should be able to use Fetchpriority. Therefore the
 engineering effort to support the `fetchpriority` attribute will involve
 decoupling that logic from the `loading` attribute.

 Last but not least, it should also be highlighted that, since
 `fetchpriority` can be used on other elements on images, we should
 consider that for the implementation. Certain parts of the implementation
 may be specific to images while other parts may apply to `fetchpriority`
 on any resource.

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Ticket URL: <https://core.trac.wordpress.org/ticket/58235>
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