CSS containment - CSS: Cascading Style Sheets | MDN

CSS Tutorials CSS basics CSS first steps CSS first steps overview What is CSS? Getting started with CSS How CSS is structured How CSS works Assessment: Styling a biography page CSS building blocks CSS building blocks overview CSS selectors Type, class, and ID selectors Attribute selectors Pseudo-classes and pseudo-elements Combinators Cascade, specificity, and inheritance Cascade layers The box mo

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CSSメモ。[contain: content;] ブラウザが処理を最適化

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“allowing developers to isolate a subtree of the page from the rest of the page.” レンダリングパフォーマンスアップ