[wp-trac] [WordPress Trac] #64150: Late-printed styles are not hoisted to HEAD if wp-block-library is not enqueued

[WordPress Trac]

#64150: Late-printed styles are not hoisted to HEAD if wp-block-library is not
enqueued
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 Reporter:  westonruter               |       Owner:  westonruter
     Type:  defect (bug)              |      Status:  closed
 Priority:  normal                    |   Milestone:  6.9
Component:  Script Loader             |     Version:  trunk
 Severity:  normal                    |  Resolution:  fixed
 Keywords:  has-patch has-unit-tests  |     Focuses:
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Changes (by westonruter):

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 In [changeset:"61076" 61076]:
 {{{
 #!CommitTicketReference repository="" revision="61076"
 Script Loader: Fall back to hoisting late-printed styles to end of `HEAD`
 if `wp-block-library` is not enqueued.

 When the `wp-block-library` stylesheet is not enqueued, there will be no
 associated inline style present. This inline style normally contains the
 placeholder CSS comment for the HTML Tag Processor to identify the token
 after which the late-printed styles should be inserted. However, when the
 `wp-block-library` stylesheet is not enqueued (such as in themes which do
 not use blocks), or else the inline style is not printed for whatever
 reason, this adds a fallback to insert the late-printed styles immediately
 before `</head>`. This ensures that late-printed styles will always get
 hoisted.

 Developed in https://github.com/WordPress/wordpress-develop/pull/10417

 Follow-up to [61008].

 Props westonruter, peterwilsoncc, Soean.
 See #64099, #43258.
 Fixes #64150.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/64150#comment:16>
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