CSS containment

Michael Scharnagl breaking down the new contain property:

If you build simple sites without tons of DOM nodes and widgets you probably dont have to care about CSS containment. On the other hand, if you build more complex sites CSS containment will help to optimize the performance. It is also a good idea to set contain: strict; for third-party widgets to protect the performance of your site.

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CSS containment is a post from CSS-Tricks