@since
class-wp-widget-area-customize-control.php
Per the documentation standards, the file header `@since` tag is supposed to specify when the file was introduced. Follow-up to [35389]. See #51800. Built from https://develop.svn.wordpress.org/trunk@49678 git-svn-id: http://core.svn.wordpress.org/trunk@49401 1a063a9b-81f0-0310-95a4-ce76da25c4cd