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Edit Post: Render metaboxes as single seamless unit #18873
This pull request seeks to improve styling interoperability between the meta box area and a themed editor background. As seen in the "Before" screenshot below, there is a plain-white margin gap which appears above the meta box area. With these changes, the margin is removed, and meta boxes changed to being contained within a single container element.
In the default development environment, you can enable the "Gutenberg Test Plugin, Meta Box" plugin to display a meta box in the metabox area.
Furthermore, I used Advanced Custom Fields to add many more meta boxes. ACF does not appear to have the option to make a meta box for the "advanced" context, so I tested this by manually editing this line to