Why Doesn't My Sticky Navigation Work When Nested Within a Positioned Element?

Troubleshooting "position:sticky" within Nested Elements

When defining sticky functionality with "position:sticky," you might encounter situations where the behavior becomes inconsistent within nested elements. Let's delve into why this occurs and how to resolve it.

Understanding the Issue

"position:sticky" positions an element relative to the viewport, creating a "sticky" effect when scrolling. However, when an element is nested within another positioned element, the "position:sticky" property behaves differently.

In your example, you have a "nav-wrapper" with "position:absolute" and a "nav" element within it with "position:sticky." The problem here is that the parent element ("nav-wrapper") defines the height of the sticky element ("nav"), leaving no room for the sticky behavior to occur within the parent element.

Resolving the Issue

To fix this, ensure that the parent element does not constrain the height of the sticky element. This can be achieved by removing the fixed height or using flexible sizing options like "min-height" or "max-height."

Example with Border for Visualization

Here's an example with a border added to the parent element for easier visualization:

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

.nav-wrapper nav {
  position: sticky;
  top: 0;
}

body {
  min-height: 200vh;
}

<div class="nav-wrapper">
  <nav>
    <a href="#">
      <li>Home</li>
    </a>
    <a href="#">
      <li>About</li>
    </a>
  </nav>
</div>

By removing the fixed height from the parent element, the sticky behavior will now work as expected within the nested element.

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