Why Isn\'t My Grid Item\'s Percentage Height Working Correctly?

Why is My Grid Element's Height Not Calculating Correctly?

The incorrect height calculation may stem from the way height percentages are interpreted in CSS grid layouts.

In your code, the grid container has a fixed height of 100px, while the grid item has a height of 200%. Normally, you would expect the grid item to occupy twice the height of the container (200px). However, this is not happening in your case.

The reason for this is that in a CSS grid layout, grid elements exist inside tracks, which in turn exist within the container. Grid items occupy rows or columns within tracks, not directly within the container.

Therefore, the height percentage of a grid item is relative to the height of the track it occupies, not the height of the container. In your code, the row has a default auto height, which allows the grid item to stretch as needed.

To resolve this issue, you must set a specific height for the row that the grid item occupies. This will ensure that the grid item's percentage height is calculated correctly relative to that height. In your modified code, the row height has been set to 100px to match the height of the container, resulting in the desired behavior:

.gridContainer {
  ...
  grid-template-rows: 100px;    /* Specifies a fixed height for the row */
}

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