Why Does Grid-gap Percentage Lead to Overflow in CSS Grid?

CSS Grid-gap Percentage Overflow: A Mystery Solved

When designing a grid layout in CSS, using percentage values for the grid-gap property can lead to unexpected overflow issues. Let's delve into the reasons behind this behavior and explore a solution to address it.

The root of the problem lies in the browser's calculation of the grid-gap. Since the grid-gap is percentage-based, its size depends on the height of the grid container. However, browsers cannot determine the height of the grid container accurately before laying out the grid items.

Initially, the browser estimates the height based on the content of the grid items. However, when the grid items overflow, the height of the grid container increases, and consequently, the calculated grid-gap also increases. This causes the overflow we observe.

To resolve this issue, we can effectively ignore the percentage value of the grid-gap. This is possible because the browser automatically computes the grid-gap as "auto" when there are overflows.

By setting the grid-gap to "auto", the browser will automatically adjust the gap between grid items based on the available space, ensuring no overflow occurs. This approach allows us to create a grid with a consistent gap size, regardless of the height of grid items.

Therefore, to avoid overflow issues with the grid-gap property, consider using "auto" instead of percentage values. This ensures that the browser can accurately calculate the grid layout and prevent unexpected overflows.

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