[wp-trac] [WordPress Trac] #63313: Add missing escapes

[WordPress Trac]

#63313: Add missing escapes
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 Reporter:  rutvikbhambhi2004  |      Owner:  (none)
     Type:  defect (bug)       |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  General            |    Version:
 Severity:  normal             |   Keywords:  has-patch
  Focuses:  coding-standards   |
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 Add missing escapes in the `wp-admin/includes/class-custom-background.php`
 file

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Ticket URL: <https://core.trac.wordpress.org/ticket/63313>
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