Why Does Sticky Positioning Break with `overflow: hidden`?

Why Sticky Positioning Behaves Unexpectedly with Overflow Hidden

In the provided HTML snippet, a sticky div is placed inside a container. Normally, it would remain visible at the top of the scrolling area within its container. This behavior mimics the headers in iOS's UITableView.

However, when the container is given an overflow:hidden style, the sticky positioning fails to function correctly.

Understanding the Effects of Overflow:hidden

The overflow:hidden rule restricts the content within the container element. Any content that exceeds the container's dimensions is hidden from view. In the case of the sticky element, the rule prevents it from protruding outside the container when it reaches the top of the scrolling area.

Sticky Positioning with Overflow:hidden

When the sticky element encounters overflow:hidden, its sticky positioning behaves erratically. The stickiness is limited to the visible area within the container. As the user scrolls, the sticky element remains constrained by the container's bounds instead of following the scrolling panel.

Alternatives to Overflow:hidden

To resolve this issue, consider using other methods to hide overflowing content:

• Using contain:paint;: This CSS property restricts overflowing content to the bounds of the container while allowing the sticky element to behave correctly.
• Introducing a Path: Instead of using overflow:hidden, create a clipping path to define the visible area within the container. This allows the sticky element to extend beyond the container's visible bounds and adhere to the desired sticky behavior.

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