Why Does `overflow: hidden` Break `position: sticky`?

Why Does overflow: hidden Prevent position: sticky from Working?

In CSS, the position: sticky property allows an element to remain visible while scrolling, up to the point where its container element scrolls out of view. This behavior mimics the fixed headers commonly seen in mobile applications.

However, when the container element has an overflow: hidden property set, the position: sticky behavior is no longer observed. This occurs because the overflow: hidden property restricts the container's size, preventing the sticky element from being repositioned outside of its visible area.

Why This Happens

When overflow: hidden is applied to a container, it essentially clips any content that exceeds its boundaries. This means that even though the sticky element is positioned outside of its container's visible area, it is effectively hidden by the overflow: hidden rule.

Modern Alternative:

To achieve the desired sticky behavior in a container with overflowing content while maintaining the ability to clip excess content, consider using the contain: paint property:

contain: paint;

contain: paint confines the rendering of child elements within the container, including overflowed content. This effectively imitates overflow: hidden while still allowing for the correct functioning of the position: sticky property.

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