CSS containment explicitly defines specific elements to browsers, avoiding unnecessary computations and improving rendering performance.

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CSS containment is a property that improves website performance by allowing developers to optimize specific areas of a webpage. It offers four crucial values: layout, paint, size, and style. These values can be combined to create independent sections within a webpage, reducing the impact of changes in that area on the whole page. Layout containment establishes a protective border around an element, paint containment ensures that an element's content is only rendered within its visible area, size containment treats an element as if it has no content when determining its size, and style containment is used for counters and quotes. CSS containment can have significant performance benefits, especially for larger applications.

Using the CSS contain property: A deep dive

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