Why is Firefox\'s `overflow-y` Inconsistent with Nested Flexbox?

Firefox's Inconsistent overflow-y on Nested Flexbox

When crafting intricate layouts with CSS3, the overflow-y property can be crucial for scrolling content within specific sections. However, users may encounter issues with this property in Firefox when nested flexbox elements are involved. This can result in undesirable scrolling behavior or the absence of a proper scrollbar.

To resolve this issue, it's important to understand the default behavior of flexbox items and their minimum size. Flex items typically establish a default minimum size based on the intrinsic size of their direct children. This behavior remains the same for hidden overflows.

Therefore, when an element with overflow: [hidden|scroll|auto] resides within a flex item, its ancestor flex item must be assigned either min-width:0 (for horizontal flex containers) or min-height:0 (for vertical flex containers). This effectively disables the automatic minimum sizing behavior and allows the flex item to shrink beyond its child's minimum content size.

By implementing this adjustment in the .level-0-row2 rule, you can correct the overflow-y behavior in Firefox and ensure proper scrolling functionality. Remember, this applies only to Firefox and is necessary because other browsers like Chrome (initially) omitted this minimum sizing behavior.

Here's the corrected code snippet with the min-height:0 adjustment:

<code class="css">.level-0-row2 {
  -webkit-box-flex: 1;
  -webkit-flex: 1;
  -ms-flex: 1;
  flex: 1;
  border: 1px solid black;
  box-sizing: border-box;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: horizontal;
  -webkit-box-direction: normal;
  -webkit-flex-direction: row;
  -ms-flex-direction: row;
  flex-direction: row;
  min-height: 0;
}</code>

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