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Script Loader: Remove default DNS prefetch entry for s.w.org.

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A default DNS prefetch entry for s.w.org was previously included to save a few ms in case an emoji is used that is not supported by the browser. It appears this use case doesn't justify a prefetch to s.w.org on every WordPress website.

This changesets removes `emoji_svg_url` prefetch from `wp_resource_hints()`. It also updates unit tests in `Tests_General_wpResourceHints` by removing `test_should_have_defaults_on_frontend()` entirely and removing s.w.org prefetch from expected output of ten other test functions.

Plugin authors can use the `wp_resource_hints` filter if they need to re-add the DNS prefetch entry for s.w.org.

Follow-up to [37920], [38122].

Props joelhardi, superpoincare, jhabdas, garrett-eclipse, sabernhardt, SergeyBiryukov.
Fixes #40426.
See #37387.


git-svn-id: https://develop.svn.wordpress.org/trunk@53904 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Jb Audras
2022-08-18 08:43:19 +00:00
parent 3ef65f72bd
commit 5aee8db5a2
2 changed files with 10 additions and 32 deletions
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7
src/wp-includes/general-template.php
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@@ -3317,13 +3317,6 @@ function wp_resource_hints() {
'prerender' => array(),
);
/*
* Add DNS prefetch for the Emoji CDN.
* The path is removed in the foreach loop below.
*/
/** This filter is documented in wp-includes/formatting.php */
$hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/13.0.0/svg/' );
foreach ( $hints as $relation_type => $urls ) {
$unique_urls = array();