How Can CSS Grid Layout Achieve Equal-Height Rows While Flexbox Cannot?

Creating Equal-Height Rows in CSS Grid Layout

In the realm of HTML and CSS layout, achieving equal height rows is a common challenge. Traditionally, this was not feasible with Flexbox due to its line-based height calculation, where each row was determined by its tallest element. However, the advent of CSS Grid Layout offers a versatile solution to this problem.

Solution: CSS Grid Layout with 1fr Units

The key to creating equal height rows in a grid is to utilize the 1fr unit for the grid-auto-rows property. This unit stands for "fractional unit" and represents a flexible length within the grid container.

<br>grid-auto-rows: 1fr;<br>

By setting the grid-auto-rows property to 1fr for all rows, we instruct the browser to distribute the available vertical space equally among them. This results in all rows having the same height.

How it Works

The magic behind 1fr lies in its ability to grow and shrink based on the content within the grid cells. When the container has an indefinite height, as is often the case in dynamic layouts, the grid tracks (in our case, the rows) are automatically resized to accommodate the tallest content.

The maximum height of the rows becomes the equivalent of 1fr, which is then multiplied by the assigned 1fr value to determine the final height of each row. In essence, all rows inherit the height of the tallest row.

Why Flexbox is Not a Viable Option

Unlike Grid Layout, Flexbox does not offer a way to create equal height rows across multiple lines. As per the Flexbox specification, the cross size (height) of each line is constrained to the smallest height necessary to fit its contents.

This behavior makes it impossible to achieve the desired effect with Flexbox alone. Only CSS Grid Layout provides the flexibility and functionality required for equal height rows across all rows in a grid.

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