Why Does `translate3d` Break My CSS `z-index` Order, and How Can I Fix It?

Maintaining CSS Z-Index Order after WebKit Transform Translate3d

In web development, stacking order is crucial for creating the desired visual hierarchy. Z-index, a CSS property, plays a significant role in controlling this order. However, it can behave unexpectedly after applying certain transforms, such as WebKit transform translate3d.

The Problem

Consider two overlapping absolutely positioned DIV elements with different z-index values. When you animate these elements off the screen using translate3d, they often lose their intended stacking order upon returning to the screen.

The Cause

This behavior stems from WebKit transform translate3d moving elements in the third dimension (z-axis). As a result, the browser can no longer rely on the z-index property to determine stacking order.

The Solution

To maintain the stacking order after translate3d, you can employ the following technique:

1. Utilize transform-style: flat:

   • Apply transform-style: flat; to child elements within the transformed parent element. This forces the browser to render the child elements in a 2D plane, thereby respecting the z-index values.

Additional Considerations

• The transform-style property is not supported by all browsers, so it may require further browser-specific workarounds.
• This solution does not affect the stacking order of the transformed element itself, only its child elements.
• To verify the desired behavior, test the code across different devices and browsers.

By understanding the impact of WebKit transform translate3d on z-index and implementing the appropriate techniques, web developers can maintain control over the stacking order of their elements, ensuring a consistent and predictable user experience.

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