Why Doesn\'t `overflow-y` Work in Firefox with Nested Flexbox?

Overflow-y Not Working in Firefox with Nested Flexbox

Many web developers are familiar with the issue where overflow-y does not work correctly in Firefox when used with nested flexbox layouts. This can be a frustrating problem to solve, especially for those who are not familiar with the intricacies of CSS3.

The problem stems from the way that Firefox calculates the minimum size of flex items. By default, flex items are sized based on the intrinsic size of their children. However, when an element inside a flex item has overflow-y applied to it, Firefox does not take this into account when calculating the minimum size. As a result, the flex item cannot shrink below the size of its child element, even if the child element has scrollable content.

To resolve this issue, it is necessary to disable the default minimum sizing behavior for flex items. This can be done by adding the min-height:0 property to the parent flex item. For instance, in the provided code example, the following CSS rule should be added to the .level-0-row2 class:

<code class="css">.level-0-row2 {
  min-height: 0;
}</code>

Once this rule is added, Firefox will correctly calculate the minimum size of the flex items and the overflow-y property will work as expected.

By understanding the underlying cause of this problem and implementing the appropriate CSS fix, web developers can ensure that their nested flexbox layouts function correctly in Firefox and other modern browsers.

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