Update Container

What it does

This ability updates an existing Elementor container specifically — it loads the target post's element tree, locates the element by element_id, and explicitly verifies the found element's elType is 'container' before touching anything, rejecting the call with a WP_Error if the element is some other type such as a widget. Once verified, it merges the supplied settings object (e.g. content_width, flex_direction, align_items, justify_content, gap, padding, background_color) into the container's existing settings and saves the updated page data back. It's the type-safe choice when you specifically want to guard against accidentally reconfiguring a non-container element; use update-element instead when the element's type is unknown or could be a widget. It returns a WP_Error if post_id, element_id, or settings are missing, if the element cannot be found, or if the found element isn't a container, and requires the 'edit_posts' capability plus 'edit_post' on the specific post_id.