How Do 3D Transforms Affect z-index Stacking Order?

3D Transforms and Z-Index: Unraveling the Mystery

When utilizing webkit transforms in CSS, particularly via translate3d, inconsistencies can arise in the behavior of z-index, affecting the stack order of elements.

In your case, you employed translate3d to animate two overlapping divs off and back onto the screen. However, post-transformation, the divs lost their prescribed z-index priority.

This occurs because when you apply a 3D transform on the z-axis (i.e., translate3d's third parameter), the traditional 2D z-index mechanism no longer applies. In a 3D rendering plane, the hierarchy is determined by the z-value of each element, effectively overriding the z-index.

To rectify this, you have two options:

1. Switch to Flat Rendering: By setting the transform-style property to flat, you can revert to 2D rendering for the child elements. This forces the browser to prioritize the z-index values again.
2. Replicate Stack Order in 3D: Unfortunately, the third parameter of translate3d does not replicate the stack order in a 3D space. You will need to manually adjust each element's z-value to achieve the desired stack order.

Additional Context:

Refer to the WebKit bug report (https://bugs.webkit.org/show_bug.cgi?id=61824) for further insights.

Target Browsers:

Both iPhone/iPad and Android browsers support webkit transitions, so you should see the issue resolved in these environments.

The above is the detailed content of How Do 3D Transforms Affect z-index Stacking Order?. For more information, please follow other related articles on the PHP Chinese website!