[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 mor10):

 Lazy loading is becoming a web standard, with implementation in Chrome
 just around the corner. This should be the model anything with lazy
 loading is based on in WordPress core:

 https://addyosmani.com/blog/lazy-loading/

 https://groups.google.com/a/chromium.org/forum/m/#!topic/blink-dev
 /jxiJvQc-gVg

 This is non-destructive and backwards compatible. Shipping it in WP core
 will lay down the necessary cowpath for widespread browser support. I
 suggest we work with the team behind this feature proposal to make a best-
 practice implementation.

 Some suggestions:

 - all images `lazy` by default.
 - first featured image on singular view `eager` by default.
 - API for theme / plugin developers to control `loading` attribute on
 case-by-case basis.
 - optional: core to ship JS shim for backwards compat.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44427#comment:8>
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