How Does a Webkit Filter Hover Affect Stacking Order?

Understanding Stacking Order Alterations in Webkit Filter Hovers

In web development, it's essential to maintain proper stacking order for elements. However, a peculiar issue can arise when hovering over images with a webkit filter applied, causing the stacking order to change.

This behavior stems from the fact that applying a webkit filter creates a stacking context, as defined in the CSS specifications. A stacking context influences the layering and positioning of elements within the browser.

When the filter is triggered by hovering, it establishes a new stacking context for the hovered image. This new context ensures that the image appears above (or below) other surrounding elements, regardless of their existing stacking order.

This stacking context creation is not an intentional effect but rather a byproduct of the webkit filter mechanism. It's important to note that setting a filter value to anything other than "none" initiates a stacking context, whether it's a grayscale filter or any other type.

To address this issue without resorting to z-indexing, which can impact other site elements, it's recommended to use alternative methods such as pseudo-elements or CSS variables to achieve the desired visibility changes without altering the stacking order.

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