How Can I Position a Child Element Behind Its Parent Using CSS Transform 3D?

How to Overlap a Child Element Behind Its Parent Using Transform 3D

Question:

How can I ensure that a dynamic child element always appears in front of its parent element, regardless of their positions in the DOM tree?

Answer:

Using CSS, you can achieve this in modern browsers with the transform 3D property:

.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 CSS configures the parent element with a 3D transformation style and positions the child element absolutely within it. The transform: translateZ(-10px) property shifts the child element 10px backwards along the z-axis, enabling it to appear behind its parent.

HTML Structure:

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

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