[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:  needs-patch needs-unit-tests  |     Focuses:  performance
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Comment (by pierlo):

 I've added lazy loading of images to theme screenshots, as @joyously
 suggested
 [https://wordpress.slack.com/archives/C5UNMSU4R/p1565710477346500?thread_ts=1565707922.333300&cid=C5UNMSU4R
 here].

 I used the lazysizes library for implementing it, and added the `native-
 loading` plugin to automatically transform `img.lazyload` elements in
 browsers that support native lazy loading.

 The media library page can also benefit from this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44427#comment:19>
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