How Does Using CSS `clip-path` (and Similar Properties) Impact the Stacking Order of Following Elements?

Why Alteration of Elements' Layering with CSS Styles Like Clip-Path (and Others) Can Affect the Stacking Order of Subsequent Elements

In CSS, the property clip-path allows elements to be shaped using polygons or circles, but users may encounter an unexpected effect on the stacking order of subsequent elements. This occurs because creating a clip-path establishes a stacking context, which separates elements from siblings and other elements in the document and places them in a separate layer for rendering.

When setting the clip-path property, the element is effectively removed from the normal flow of the document and placed into a new stacking context. In this new layer, the element will affect the stacking of subsequent elements in the tree order, or the sequence in which elements are added to the document.

This stacking order is defined by the CSS Box Model, which sets the following rules for stacking:

• Positioned elements (with position: absolute, fixed, or relative): These elements are placed in their own layers above non-positioned elements.
• Opacity: Elements with opacity values less than 1 create new stacking contexts.
• Transformations: Elements with transformations (e.g., rotate, translate, scale) also establish stacking contexts.

Therefore, in the example provided, when the clip-path property is applied to the header element, it establishes a stacking context. This stacking context causes the image element to be rendered below the header, even though it appears later in the DOM. To correct this, you can manually add position: relative to the image element, which will place it in a separate layer and restore the desired stacking order.

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