[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:  voldemortensen
     Type:  feature request           |      Status:  assigned
 Priority:  normal                    |   Milestone:  4.6
Component:  Script Loader             |     Version:
 Severity:  normal                    |  Resolution:
 Keywords:  has-patch has-unit-tests  |     Focuses:  performance
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Comment (by swissspidy):

 [attachment:34292.6.diff] is an alternative patch with a more simplified
 approach.

 * Changes the naming of the function to `wp_resource_hints()`, as
 `wp_browser_hints()` to me sounds like a browsehappy.com browser nag.
 Resource hints is more accurate.
 * Moves the admin parts into that function as it's only a few lines of
 code and not much added complexity.
 * Simplifies the logic to get rid of `unique_browser_hints()` and
 `add_prefetch_attr()`
 * Improves unit tests to test the admin parts as well. Moves the various
 `$preexpected` assertions to a separate test.
 * Adds one single `wp_resource_hints` filter.

 To do:

 * Add test for scripts and styles enqueuing.
 * Add assertion for the `parse_url()` part for `dns-prefetch`
 * Decide whether the filter makes sense inside the `foreach` loop or if it
 should be outside.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34292#comment:32>
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