[wp-trac] [WordPress Trac] #34292: Support for DNS Prefetching & Prerender

[WordPress Trac]

#34292: Support for DNS Prefetching & Prerender
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 Reporter:  bhubbard                             |       Owner:
     Type:  feature request                      |  voldemortensen
 Priority:  normal                               |      Status:  closed
Component:  Script Loader                        |   Milestone:  4.6
 Severity:  normal                               |     Version:
 Keywords:  has-patch has-unit-tests needs-dev-  |  Resolution:  fixed
  note needs-docs                                |     Focuses:
                                                 |  performance
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Comment (by swissspidy):

 @GaryJ Thanks for pointing out! That function really can be optimized.

 In [attachment:34292.10.diff]:

 * Rename `wp_resource_hints_scripts_styles()` to
 `wp_dependencies_unique_hosts()` (other suggestions welcome)
 * Only returns unique hosts for ''enqueued'' dependencies. Otherwise you
 get unneeded entries for fonts.googleapis.com and stuff like that
 * Fixes docs
 * Removes duplicated code by looping over `$wp_scripts` and `$wp_styles`
 as they both extend the `WP_Dependencies` class

 Worth noting: The unit tests still pass with this patch applied. They
 shouldn't, i.e. we need a new test.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34292#comment:49>
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