Why Does Nested Sticky Positioning Fail, and How Can I Fix It?

Sticky Positioning Dilemma: Why It Fails When Nested

When placing an element with position: sticky inside another element, it may cease to behave as expected. That's because sticky positioning considers the dimensions of its parent element.

Understanding the Issue

In the example provided:

.nav-wrapper {
  position: absolute;
  bottom: 0;
}

The parent element (nav-wrapper) defines its height based on the height of the nav element.

<div class="nav-wrapper">
  <nav>
    <a href="#">...</a>
    <a href="#">...</a>
  </nav>
</div>

With nav having a position: sticky, it expects to stick to the top of the browser window. However, since the parent element takes up all the available vertical space, there's no room for the nav to stick to.

Resolving the Issue

To make sticky work in this scenario, you can give the nav element its own height, independent of its parent:

.nav-wrapper {
  position: absolute;
  bottom: 0;
  height: 50px;
}

.nav-wrapper nav {
  position: sticky;
  top: 0;
  height: 100%;
}

By setting the height of both the nav-wrapper and nav, you create enough vertical space for the sticky positioning to function correctly.

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