Auto-fill or Auto-fit in CSS Grid: When Should You Choose Which?

Auto-fill vs. Auto-fit: Preserving Grid Layout

In CSS grids, leveraging repeat(auto-fit, minmax()) for card layouts presents challenges when rows lack sufficient items to fill all columns. To resolve this, consider utilizing auto-fill instead.

Understanding Auto-fit and Auto-fill

Both auto-fit and auto-fill aim to create grid tracks (columns or rows) dynamically without overflowing the container. However, their behavior differs when the number of grid items falls short of the created tracks.

Auto-fit Behavior

With auto-fit, empty tracks are collapsed, freeing up space that is redistributed among existing items. This results in card-like items expanding to fill the entire row, even when there are gaps.

Auto-fill Behavior

Auto-fill maintains empty tracks, preserving the grid layout. Items are placed within the tracks, and any remaining empty tracks are left intact. This ensures that the grid structure remains consistent, regardless of the number of items.

Visual Comparison

Consider a scenario with three grid items:

Auto-fill:

grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));

[Image of three grid items with empty tracks preserved]

Auto-fit:

grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));

[Image of three grid items expanded to fill the row]

Conclusion

For layouts where preserving the grid structure is crucial, regardless of the number of items, utilizing auto-fill is recommended. This ensures that card-like items maintain their desired shape and spacing, even when rows contain gaps or partially filled tracks.

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