What is the primary effect of the ‘contain’ CSS property with a value of ‘strict’ on an element?

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The 'contain: strict' property tells the browser that the element's subtree is independent of the rest of the page. This allows the browser to optimize rendering by skipping layout, style, and paint calculations for the rest of the document when changes occur inside the contained element. It does not disable inheritance or hardware acceleration, nor does it ignore parent styles entirely; it merely isolates the layout and rendering scope.