Why Isn't My Sticky Navigation Working Inside a Nested Element?

Why position:sticky Isn't Functioning in a Nested Element

When employing sticky navigation, you may encounter a challenge where the sticky behavior fails to work once the navigation element is enclosed within another element. This is due to the way position:sticky functions.

Understanding position:sticky

position:sticky positions an element relative to its normal flow. However, position:sticky yields to the containing element's layout. In your scenario, the parent element is defined with a fixed height, determined by the position:sticky element's height. As a result, the sticky element lacks space to behave stickily.

Visualizing the Issue

To illustrate the problem, add a border to the parent element:

.nav-wrapper {
  position: absolute;
  bottom: 0;
  border: 2px solid;
}

You'll notice that the sticky element is contained within the parent element's fixed height.

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