Why position: sticky Fails: A Hidden overflow Setting Is Often the Cause

A developer found that a sticky header on their page would not stay pinned while scrolling, despite standard troubleshooting. The cause was an ancestor wrapper with overflow set to hidden, which makes sticky elements stick to that wrapper instead of the page. The wrapper never scrolls, so the header scrolls away with it. The article suggests removing the unnecessary overflow property or switching to overflow: clip, which keeps sticky working but cannot scroll clipped content and may hide focusable elements from keyboard users. It also warns that overflow-x: hidden can quietly trigger the same behavior.