How Can CSS Grid Achieve Equal Height Rows Unlike Flexbox?

Equal Height Rows in CSS Grid Layout: A Detailed Explanation

In contrast to Flexbox, where row heights are dictated by the minimal height required for its elements, CSS Grid Layout empowers developers to achieve equal height rows across an entire grid.

Grid Layout Solution

The key to achieving equal heights lies in setting the grid container's grid-auto-rows property to 1fr. Fr units are designed to distribute free space in a container, akin to the flex-grow property in Flexbox.

By setting grid-auto-rows: 1fr, all rows within the grid will have equal heights. This might seem counterintuitive since fr should allocate space dynamically.

Understanding the Fr Unit

However, the CSS Grid specification unveils a crucial nuance: when dealing with dynamic grid dimensions, "grid tracks" (rows in this case) resize to accommodate their content. The height of each row then adapts to the tallest (max-content) grid item.

The maximum height of these rows becomes the length of 1fr, which is subsequently multiplied by each grid track's flex factor to determine its final size. This mechanism ensures equal heights across all rows.

Why Flexbox Falls Short

Flexbox, unlike CSS Grid, cannot facilitate equal row heights across multiple rows. Flex items can only achieve equal heights within the same row, per the Flexbox spec:

"In a multi-line flex container, the cross size of each line is the minimum size necessary to contain the flex items on the line." This stipulation prevents Flexbox from expanding rows beyond their minimal height.

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