Can Grid Items Span to the Last Cell in Implicit CSS Grids?

Can Grid Items Span to the Last Grid Cell in Implicit Grids?

Grid layouts are commonly used to organize content into rows and columns. In some scenarios, it may be desirable for an item to span across multiple rows or columns, regardless of the number of rows or columns in the grid. However, this can pose a challenge when using implicit grids, where the number of rows and columns is not explicitly defined.

In the example provided, a container contains a dynamic number of boxes arranged in an implicit grid. The task is to make the third box span from the first grid line to the last. While it may appear that a simple Grid solution should suffice, the CSS Grid Level 1 specification does not currently support such a solution.

However, a workaround using absolute positioning is suggested in another reference.

Addressing the Issue in Explicit Grids

While spanning across cells is not possible in implicit grids, it can be achieved in explicit grids, where the exact number of rows and columns is defined using properties such as grid-template-rows, grid-template-columns, and grid-template-areas.

According to the CSS Grid specification, negative integers can be used to count from the end edge of an explicit grid. By utilizing this feature, we can achieve the desired behavior:

grid-column: 3 / -1;

This syntax will span the grid area from the third column line to the last column line. Similarly, the following would span from the first column line to the third column line:

grid-column: 1 / -3;

It's important to note that this approach is only applicable to explicit grids, where the specific row and column count is defined.

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