How Does `overflow: auto` Resolve Float Display Issues?

Why Overflow: Auto Resolves Float Display Issues

When creating multiple columns using floating elements, the common problem arises where the parent wrapper fails to expand to fit its floated children. This occurs because floats are removed from the regular content flow, causing the wrapper to ignore their existence.

To rectify this issue, overflow: auto can be applied to the wrapper. This technique establishes a new block formatting context (BFC) for the floats, forcing the wrapper to contain them. BFCs establish boundaries that prevent floats from interfering with other elements in their parent context.

It's crucial to note that overflow: auto does not "clear" floats, as clearing requires a dedicated clearing element after the last floated element. A parent element cannot clear its own floated children.

Overflow: auto creates a BFC by meeting the following criteria:

1. The element has an overflow property (e.g., overflow: auto).
2. The element is not statically positioned (position: static).

By satisfying these conditions, the wrapper element creates a BFC, which forces the floated children to remain contained within its boundaries, ensuring proper height adjustment to accommodate the floated columns.

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