[wp-trac] [WordPress Trac] #42438: preload is missing from ressource hints.

[WordPress Trac]

#42438: preload is missing from ressource hints.
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 Reporter:  nico23                      |       Owner:  swissspidy
     Type:  defect (bug)                |      Status:  assigned
 Priority:  normal                      |   Milestone:  5.0
Component:  Script Loader               |     Version:  4.9
 Severity:  normal                      |  Resolution:
 Keywords:  has-patch needs-unit-tests  |     Focuses:
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Comment (by igrigorik):

 Hey folks! Would love to see preload available in core. A couple of drive-
 by thoughts..

 Resource Hints [1] and Preload [2] have different semantics; Resource
 Hints != Preload.
  - dns-prefect, preconnect, prefetch, prerender are speculative
 optimization hints
  - preload is a ''directive'' to the UA to fetch the resource

 Addy Osmani has a nice writeup on the differences [3]. My recommendation
 would be to keep Preload and RH as separate APIs, because they have
 different processing behavior and attributes. Case in point, current
 wp_resource_hints() exposes "as" attribute, but that only applies to
 rel=preload resources. On a related note "pr" attribute is now deprecated,
 so that can be removed from the function as well.

 Concretely, I'd propose...
   1. Do some cleanup on wp_resource_hints() to remove "pr" and "as".
   1. Expose new wp_preload() function to emit preload links.

 WDYT? Crazytalk? :)

 ---
 [1] https://w3c.github.io/resource-hints/
 [2] https://w3c.github.io/preload/
 [3] https://medium.com/reloading/preload-prefetch-and-priorities-in-
 chrome-776165961bbf

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Ticket URL: <https://core.trac.wordpress.org/ticket/42438#comment:3>
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