Does Margin Collapsing Occur in Flexbox Layouts?

Margin Collapsing in Flexbox: Understanding Flex Formatting Contexts

In CSS, margin collapsing is a behavior where the margins of the parent and its last child element combine to create a single margin. This occurs when both the parent and child elements are block-level elements. However, this behavior changes when using flexbox.

Understanding Flex Formatting Contexts

Flexbox introduces a new concept called the "flex formatting context." Unlike the traditional block formatting context, the flex formatting context creates its own set of rules for layout and margin handling. One of the key differences is that margin collapsing does not occur in flex formatting contexts.

Why Flexbox Margins Differ

In a non-flexbox layout, the margin collapse occurs because the parent and child elements are both block-level elements that participate in the same block formatting context. However, in a flex formatting context, the flex container establishes a separate formatting context where flex layout is used instead of block layout.

Preventing Margin Collapsing in Flexbox

As stated earlier, margin collapsing does not occur in flex formatting contexts. Therefore, to prevent margin collapsing between the last article and footer in the provided example, you do not need to make any changes. The flexbox layout already eliminates the margin collapse.

In Summary

In summary, margin collapsing is a feature of block formatting contexts and does not occur in flex formatting contexts. This is because flexbox establishes a new formatting context where flex layout is used and margins do not collapse in the same way as in block-level layouts.

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