Combining sticky headers with full height elements | App Developer Magazine
Briefly

As Philip Braunen points out, "Sticky positioning is one of those CSS features that's pretty delicate and can be negated by a lot of things." This complexity arises when sticky elements need to coordinate with other elements to form a combined height, such as `100vh`. Understanding sticky behavior in relation to viewport height is essential for successful implementation.
Sticky headers are a popular design choice for many websites, offering a convenient way to keep navigation menus or other important content visible as users scroll through a page. However, the implementation of sticky positioning in CSS can be fraught with challenges.
The primary challenge is that sticky positioning relies on the viewport to determine its behavior. When full-height elements are involved, the viewport's height can be altered, leading to conflicts and the loss of the sticky effect.
To address this, Braunen suggests a solution that involves careful planning and consideration of the layout structure. One approach is to ensure that sticky elements are not intrusively affected by other surrounding elements.
Read at App Developer Magazine
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