« /**
* Prepares a single global styles config for update.
*
* @since 5.9.0
* @since 6.2.0 Added validation of styles.css property.
* @since 6.6.0 Added registration of block style variations from theme.json sources (theme.json, user theme.json, partials).
*
* @param WP_REST_Request $request Request object.
* @return stdClass|WP_Error Prepared item on success. WP_Error on when the custom CSS is not
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