Migrate 'Custom CSS' to WordPress CSS Editor #49
Description
WordPress 4.7 introduced Custom CSS Editor.
Ref: https://make.wordpress.org/core/2016/11/26/extending-the-custom-css-editor/
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WordPress 4.7 introduced Custom CSS Editor.
Ref: https://make.wordpress.org/core/2016/11/26/extending-the-custom-css-editor/