Why does the fixed position interfere with the functionality of overflow hidden?

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The fixed position interferes with the functionality of overflow hidden because when an element is fixed, it is positioned relative to the browser window and is not affected by scrolling. So if a parent element is set to overflow hidden and a child element is fixed, the child element will be hidden along with its content, as it is positioned outside of the parent element's visible area. This can cause issues with the layout and functionality of the page, especially if the fixed element contains important content or interactive elements.