[wp-trac] [WordPress Trac] #30713: Customizer control subclasses (custom controls) should have all parent control types as html classes

[WordPress Trac]

#30713: Customizer control subclasses (custom controls) should have all parent
control types as html classes
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 Reporter:  celloexpressions  |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Future Release
Component:  Customize         |    Version:  trunk
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:                    |
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 See https://wordpress.slack.com/archives/core/p1418599325001596. This will
 let us simplify our css selectors, and make it easier to create custom
 controls without duplicating core css. Particularly notable with the core
 media controls, which are nested several levels deep ((potentially-in-the-
 future media) -> upload -> image -> background-image/header-image).

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Ticket URL: <https://core.trac.wordpress.org/ticket/30713>
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