What CSS Properties Create Stacking Contexts?

CSS Properties That Establish Stacking Contexts

Stacking contexts are fundamental concepts in CSS layout, responsible for determining the stacking order of elements on the page. While the property that immediately comes to mind is z-index, there are numerous other CSS properties that create their own stacking context.

In addition to z-index, the following properties trigger stacking contexts for the affected elements:

• opacity (when set to a value less than 1)
• transform (when set to any value other than none)
• perspective (when set to a value other than none)

Additionally, several other properties can lead to the creation of stacking contexts, including:

• flow-from (when set to a value other than none)
• filter (when set to a value other than none)
• isolation (when set to isolate)
• will-change (when set to a property that creates a stacking context)
• clip-path and mask (when set to values other than none)

It's crucial to note that these properties establish independent stacking contexts for the elements they apply to. Elements within a stacking context do not interact with elements from other contexts, greatly simplifying the layout process.

While stacking contexts are invaluable for controlling the stacking order of elements, it's also essential to avoid creating unnecessary stacking contexts, as they can impact performance. Understanding the properties that create stacking contexts allows developers to optimize their CSS code for efficient rendering.

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