Why Doesn't My Sticky Element Work in a Flexbox Container?

Flexbox Gotcha: Position: Sticky Element Behaves Unpredictably

Developers often encounter unexpected behavior when using position: sticky within a flexbox container. By default, flexbox elements stretch to fill the available space, resulting in equal heights for all elements, which precludes scrolling and renders the sticky element non-functional.

The solution lies in modifying the sticky element's align-self property to flex-start, which resets its height to auto. This enables scrolling and allows the sticky element to adhere to its intended position.

Example:

In the following code, the sticky element was not functioning correctly until align-self: flex-start was added:

<div>

.flexbox-wrapper {
  display: flex;
  overflow: auto;
  height: 200px;
}
.sticky {
  position: sticky;
  top: 0;
  align-self: flex-start;
  background-color: red;
}

Browser Support:

• align-self: flex-start is supported in all major browsers, except Safari, which requires the -webkit- prefix:

  .sticky {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    align-self: flex-start;
  }

By implementing this fix, developers can ensure that position: sticky elements behave as intended within flexbox containers.

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