What is the specific effect of the 'contain: strict' CSS property on a layout container?

Explanation

The 'contain: strict' property is equivalent to 'contain: size layout style paint'. It tells the browser that the element's subtree is independent of the rest of the document. This allows the browser to optimize performance by skipping layout and paint calculations for the rest of the page when changes occur inside the contained element. It is not merely a clipping mechanism, but a structural isolation directive.

Key points

Strict containment implies size, layout, style, and paint containment.
It enables significant performance optimizations for complex DOM trees.
Changes inside the container do not trigger reflows outside the container.

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What is the specific effect of the ‘contain: strict’ CSS property on a layout container?