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In the latter block, each division might have a different class name or perhaps different additional classes applied. This allows for greater flexibility in rearranging them in the layout. In the first block of code, the three content divisions will always reside inside their parent container.

With CSS, we have the ability to rearrange blocks inside a container. We don’t have the ability to break content out of one container and move it inside another container. If you want more mixing of blocks, then you’ll need fewer containers.

there are currently far more instances of websites that are dropping columns wholesale

Every element is its own unique block and serves as its own container. The page’s main heading is its own contained block. All of the meta information is inside another container directly below it. After that, every paragraph, subheading and image is also its own self-contained block of content. The same goes for anything else that might end up in a post, such as a block quote or code block.

a challenge to how we think about structuring our HTML, particularly to how we use containers. Elements can’t move from one container to the next. We can fake it with complex CSS, or we can rewrite the HTML with JavaScript; but, ultimately, if we want to intermix elements, we’re best of using fewer HTML containers to create columns. Instead, we should leave more of our content blocks in their own containers and use CSS to create virtual columns in the layout. This solution doesn’t confine our elements to structural containers and instead enables us to more easily rearrange the elements in different layouts.