`.custom-background` should only be added if a background color or an image divert from their defaults. This behavior exists already in `_custom_background_cb()`. props slobodanmanic, nitkr, valendesigns, obenland. see [21054], [21001]. fixes #28687. Built from https://develop.svn.wordpress.org/trunk@32081 git-svn-id: http://core.svn.wordpress.org/trunk@32060 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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