[wp-trac] [WordPress Trac] #44427: Introduce lazy-loading API for media and other elements

[WordPress Trac]

#44427: Introduce lazy-loading API for media and other elements
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 Reporter:  mor10            |       Owner:  (none)
     Type:  feature request  |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Media            |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
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Comment (by tabrisrp):

 Agreed, and it also simplifies the implementation as no additional
 Javascript would be required by default. If adding a shim, it should only
 support `IntersectionObserver now`, as it's supported in all modern
 browsers now (Safari 12.2 was the last to adopt it).

 This also removes the need to brainstorm on data attributes to use to
 allow/disable lazyload.

 Adding support via `add_theme_support( 'lazy-load-images' );` and
 `add_theme_support( 'lazy-load-iframes' );` will allow themes and plugins
 developer to provide specific value for any image/iframe handled.

 Examples: adding a `loading="eager"` value for the logo in the header for
 a theme or the first slide of a slider created with a slider plugin, while
 the rest of the slides have the `loading="lazy"` value.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44427#comment:10>
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