CSS was fairly simple, as Shadow DOM already does heavy lifting here. Every shadow DOM would sit in container element that would have overflow: hidden, and a fairly new property called contain. It would be set to strict, which prevents any escapes and hopefully helps with performance.
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В России предупредили о подготовке ВСУ к контратаке на одном направлении08:42。关于这个话题，PDF资料提供了深入分析
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