Why Does `flex-direction: column-reverse` Disable Scrolling in Firefox, Edge, and IE?

Flexbox Column-Reverse Issue in Firefox, Edge, and IE

When creating responsive applications, it's common to use Flexbox to display content. In certain scenarios, you may want to reverse the order of elements when the screen size changes. While this works seamlessly in Chrome, a puzzling issue arises in Firefox, Edge, and Internet Explorer.

The issue becomes apparent when using flex-direction: column-reverse to reverse the item order. In Chrome, the scrollbar behaves as expected, allowing users to scroll up to view previous items. However, in the affected browsers, the scrollbar appears but remains disabled.

To demonstrate this issue, let's examine the following code:

<code class="css">#list {
  display: flex;
  flex-direction: column-reverse;
  height: 250px;
  overflow-y: scroll;
  border: 1px solid black;
}

.item {
  flex: 1;
  padding: 2em;
  border: 1px dashed green;
}</code>

When using this code, you'll notice the aforementioned issue in Firefox, Edge, and IE.

Root Cause and Resolution

This issue stems from a bug present in the affected browsers. Specifically, when using flex-direction: column-reverse and overflow-y: auto, the scrollbar doesn't function as intended.

As a workaround, you can use column instead of flex-direction: column-reverse. This approach will achieve the same visual effect and ensure that the scrollbar works correctly in all supported browsers.

Additional Information

For further details and insights into this issue, refer to the following resources:

• [Flexbugs - Column-reverse and overflow-y not scrollable](https://github.com/philipwalton/flexbugs/issues/104)
• [Bug 1042151 - flex-direction: column-reverse (or "flex-direction:column; justify-content:flex-end") with overflow-y: auto is not scrollable](https://bugzilla.mozilla.org/show_bug.cgi?id=1042151)

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