Why Does the Last Margin/Padding Collapse in Flexbox/Grid Layouts?

Last Margin / Padding Collapsing in Flexbox / Grid Layout

When using flexbox or grid layouts to arrange content horizontally, a common issue is that the last margin or padding on an element may collapse. This occurs because the overflow property, which specifies how content beyond an element's box is handled, does not extend to padding or margins.

To resolve this issue, we must determine the underlying problem causing the collapse. We will examine two potential problems:

Potential Problem 1: Collapse Due to Overflow

In the case where the last margin is ignored, the overflow assigned to the container does not apply to the margins. As the overflow property only covers the content box, it will clip any content overflowing the container but has no effect on padding or margins.

Potential Problem 2: Collapse Outside Flex / Grid Contexts

In certain scenarios, the last margin may not collapse within a flex or grid context but appear to collapse in block layouts. This inconsistency could indicate that overflow is permitted to affect margins and paddings despite the specification's assertion that it does not.

To accurately address this issue, we recommend verifying the cause of the collapse based on the specific scenario and applying the appropriate solution accordingly.

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