Does CSS `translateZ(0)` Improve Performance, or Create Stacking Context Issues?

The Implications of CSS 'translateZ(0)' on Performance

Recent discussions have highlighted the purported performance benefits of using 'transform: translateZ(0)' to create a 3D illusion and enhance animations and transitions. This has raised concerns about the broader impact of employing this transformation technique.

The Impact on Stacking Context

Applying 'translateZ(0)' creates a new stacking context, resulting in the following consequences:

• Fixed position elements will behave like absolutely positioned elements.
• Z-index values may become unreliable.

This behavior can be observed in a live demo, where a transformation applied to the second div creates a stacking context, causing its pseudo elements to be stacked above instead of below.

Best Practices

To avoid these drawbacks, it is recommended to use 'translateZ(0)' only when necessary for optimization. Alternatively, 'webkit-font-smoothing: antialiased;' can provide similar 3D acceleration benefits without creating stacking context issues, albeit only in Safari.

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