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Speed up rendering with content-visibility: auto ⚡ This CSS property skips rendering off-screen content until needed, giving massive performance wins on long pages. ⋅ Pairs with contain-intrinsic-size ⋅ Zero-effort lazy rendering Learn more 👇 developer.mozilla.org/en-US/docs/...

why is auto not the default? the linked mdn page lists no downsides

auto comes with restrictions, e.g. margin collapse and other things that would affect already layout things do not work anymore. But for many situations this would still be a good default and starting point. Maybe content-visibility: auto; will find its way into templates?