[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 pcfreak30):

 While I like this idea, I think it should be pointed out that we should
 not re-invent the wheel with a lazyload library. Not sure if that was
 anyone thought process, but seemed like it. One that I have seen google
 link to (forgot where) and as a link on pagespeed I think, is
 https://github.com/aFarkas/lazysizes.

 They also have an `IntersectionObserver` version at
 https://github.com/aFarkas/lazysizes/blob/gh-pages/src/lazysizes-
 intersection.js which uses no scroll timers. The code uses no jquery and
 also makes changes with requestAnimationFrame with a simplistic queue
 system for performance vs setTimeout. Among it is a folder with like 20
 plugins, thus can be used for custom ones.

 Thanks.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44427#comment:12>
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