[wp-trac] [WordPress Trac] #52139: Twenty Twenty-One: Skip loading attribute on featured image instead of loading=eager

[WordPress Trac]

#52139: Twenty Twenty-One: Skip loading attribute on featured image instead of
loading=eager
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 Reporter:  flixos90       |       Owner:  flixos90
     Type:  defect (bug)   |      Status:  assigned
 Priority:  normal         |   Milestone:  5.6.1
Component:  Bundled Theme  |     Version:  5.6
 Severity:  normal         |  Resolution:
 Keywords:  has-patch      |     Focuses:
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Comment (by ryelle):

 The reasoning for not adding `loading="eager"` [https://web.dev/browser-
 level-lazy-loading-for-cmss/#allow-per-element-modifications described
 here] makes sense to me.

 > While using `loading="eager"` is a supported alternative, this would
 tell the browser explicitly to always load the image right away, which
 would prevent potential benefits if browsers implemented further
 mechanisms and heuristics to automatically decide which elements to lazy-
 load.

 While `eager` is the default value for `loading`, explicitly setting it
 communicates something to the browser that might block future performance
 benefits.

 Setting `loading` to `false` removes the lazy-loading from the image,
 which should prevent any layout shift.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52139#comment:6>
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