[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:  enhancement                          |      Status:  closed
 Priority:  normal                               |   Milestone:  5.5
Component:  Media                                |     Version:  5.4
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests 2nd-        |     Focuses:
  opinion early needs-testing has-dev-note       |  performance
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Comment (by flixos90):

 > Replying to [comment:118 johnstonphilip]:
 > > Are there any proposed limits on what this function might do...
 >
 > This function (and its predecessor) have been used only for back-fills
 of new, significant HTML features to existing posts/content. Don't think
 that will change.

 To add to that, this function is more generic than its predecessor to
 allow for the existing and future cases where we'll need to back-fill
 attributes to happen in a more performant way (e.g. combined regex). If a
 plugin would like fine-grained control (e.g. lazy-load images but not add
 responsive attributes), it should preferably not unhook the entire
 function, but use the more specific filters available.

 If a plugin has its own special type of content that it would like to
 receive similar treatment for, that's probably the only case that this
 function should be manually called.

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Ticket URL: <https://core.trac.wordpress.org/ticket/44427#comment:120>
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