[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:  flixos90
     Type:  feature request                      |      Status:  assigned
 Priority:  normal                               |   Milestone:  5.4
Component:  Media                                |     Version:
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch has-unit-tests 2nd-        |     Focuses:
  opinion                                        |  performance
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Comment (by flixos90):

 I like the suggestions by @mikeschroder @peterwilsoncc @azaozz to:

 * prepare a proposal post for the make blog
 * create a feature plugin for easy testing

 I'll kickstart these two things and will invite all of you for
 collaboration and review.

 With both of this together, we'll be able to get more feedback on the
 interoperability with people's sites, whether this causes any unexpected
 side effects.

 @spacedmonkey Our Lazyload plugin encompasses a bit more than the core-
 envisioned solution (as in the patches here), so that IMO isn't suitable
 as feature plugin. I'll transfer the latest patch
 [attachment:"44427.8.diff"] into a feature plugin as is.

 Regarding relying on theme support, I'd advocate against this. It would
 potentially allow us to get it merged more quickly, but I feel like we
 shouldn't do this because
 * either it becomes one of these conventions that every theme adds support
 to, which is pointless, and would then result in it being de-facto always
 on anyway (which defeats the purpose of theme support)
 * or it doesn't become one of these conventions, which will result in
 probably 5% of themes adding support which largely limits the positive
 performance impact this would have otherwise

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Ticket URL: <https://core.trac.wordpress.org/ticket/44427#comment:84>
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