The cover block is similar to the group with a few additional features. In addition to being able to nest child blocks within it, it also allows positioning of these blocks vertically and horizontally. The minimum height can be set in order to best fit your design.
The cover block also allows you to assign a background image and set its focal point.
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What are the advantages?
The cover block is most commonly used to create a hero section. However, it can also be used anywhere you need to place items on top of a background image.
What are the disadvantages?
The shortcomings of the cover are very similar to the group. In which the child blocks are displayed vertically. This can be overcome by using columns or rows within the cover if needed for your design.
Need more control?
While the WordPress block editor is much more powerful than it was even a few years ago, it still has limitations as a design tool. It is still best used for content. Many web creators choose a page builder such as Elementor to have a much greater control over the design of their website. Using the Elementor flexbox container widget, rather than the cover block, will provide you with the ability to design differently for desktop, tablet, and mobile.