Does Globally Applying `translateZ(0)` for CSS Performance Enhancements Cause Unexpected Z-Index Behavior?

3D Transformations: Implications of translateZ(0)

CSS performance enhancements often involve tricking the GPU into perceiving elements as 3D to optimize animations and transitions. One such technique is utilizing the transform: translateZ(0) property. However, questions arise regarding the consequences of applying this transform globally, as seen in the following code:

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

Implications:

Despite its performance benefits, employing translateZ(0) has certain implications:

• New Stacking Context and Containing Block: CSS transformations establish a new stacking context and containing block, causing fixed-position elements with applied transformations to behave more like absolutely positioned elements, disrupting z-index values.
• Z-Index Disruption: As illustrated in the example provided, the creation of a new stacking context can lead to unexpected z-index behavior, where pseudo elements appear on top rather than beneath the transformed element.

Recommendation:

To avoid potential issues, it's advisable to apply 3D transformations judiciously, only when necessary for optimization. Additionally, -webkit-font-smoothing: antialiased; can exploit 3D acceleration without the same consequences, but its effectiveness is limited to Safari.

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