[wp-trac] [WordPress Trac] #49972: Add `rel="preload"` links/relation_type to `wp_resource_hints`

[WordPress Trac]

#49972: Add `rel="preload"` links/relation_type to `wp_resource_hints`
--------------------------+-----------------------------
 Reporter:  apedog        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Add {{{'preload'}}} array to {{{wp_resource_hints()}}} and  echo
 {{{rel="preload"}}} links into HTML head.

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Ticket URL: <https://core.trac.wordpress.org/ticket/49972>
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