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I think the main cause of black rectangle is the lack of support for nested CSS. At least that's what I'm seeing in my browser.

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Ohhh interesting. To anyone hitting this, I'm curious what specific browser you're using - I thought it was available ~everywhere now? https://caniuse.com/css-nesting

Seeing only inverted smilie over black background on my iPad, dark mode or light both.

I can't replicate on mine. If this is due to nested styles, I think you are behind on your software updates :). But also, maybe I need to hold off a bit longer before moving to nested styles.

According to a forum post [1], e.g. iPad Mini 4 was discontinued March 2019 and is stuck on iOS 15, which doesn't support nested styles. Perhaps the issue is that people want to continue using old tablet devices that are no longer getting OS updates?

[1] https://education.apple.com/resource/250012027

It's only been available everywhere since like 2023. My browser happens to be from 2022.

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