How Can I Make a Child Element Always Appear Above Its Parent Using CSS?

Reordering Child Elements with CSS

Question:

How can we ensure a child element always appears on top of its parent, regardless of their position in the DOM tree?

Answer:

Recent advancements in CSS allow us to achieve this with CSS transforms.

In modern browsers, we can utilize transform-style: preserve-3d and transform: translateZ(-10px) on the child element to push it behind its parent.

Code Sample:

<div class="parent">
  Parent
  <div class="child">
    Child
  </div>
</div>

.parent {
  background: red;
  width: 100px;
  height: 100px;
  transform-style: preserve-3d;
  position: relative;
}

.child {
  background: blue;
  width: 100px;
  height: 100px;
  position: absolute;
  top: -5px;
  left: -5px;
  transform: translateZ(-10px);
}

This solution allows for dynamic reordering of child elements without resorting to absolute or fixed positioning. It ensures that the child element remains on top while maintaining flexibility for various use cases.

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