Does `translateZ(0)` Improve Performance at the Cost of Positioning Accuracy?

Does translateZ(0) Affect CSS Performance and Positioning?

Blogs often emphasize the performance benefits of using transform: translateZ(0) to create the illusion of a 3D element for faster animations and transitions. However, it's crucial to understand the potential implications of using this transform excessively.

When applied globally as in the given code:

* {
    -webkit-transform: translateZ(0);
    -moz-transform: translateZ(0);
    -ms-transform: translateZ(0);
    -o-transform: translateZ(0);
    transform: translateZ(0);
}

this transformation creates a new stacking context for every element. Consequently, fixed-positioned elements with this transform will behave more like absolutely positioned elements, and z-index values may become unpredictable.

To illustrate, consider the following demo:

<div>
  <div>

In this demo, the second div, which has a transform applied, creates a new stacking context. As a result, its pseudo-elements appear above the non-fixed positioned element instead of below it.

Therefore, it's essential to use a 3D transformation sparingly and only when the optimization is necessary. -webkit-font-smoothing: antialiased; is another method to leverage 3D acceleration without encountering these positioning issues, although its compatibility is limited to Safari.

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