Are these transitions supposed to be animated, i.e. the video changes size over a few seconds? Because it just jumps instantly to the new size for me on both Firefox and Chrome.
Yep, that was it. This is not the first time a website failed to perform as advertised because of this. To be clear, I'm blaming the websites or their creators; this is not a bug, but rather a feature working exactly as intended. But I would recommend that if you're showcasing a feature that depends on a certain setting, and that setting isn't set, then you should show a warning of some sort (implementation details left as an exercise for the developer).
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Are these transitions supposed to be animated, i.e. the video changes size over a few seconds? Because it just jumps instantly to the new size for me on both Firefox and Chrome.
Maybe prefer-reduced-motion?
Yep, that was it. This is not the first time a website failed to perform as advertised because of this. To be clear, I'm blaming the websites or their creators; this is not a bug, but rather a feature working exactly as intended. But I would recommend that if you're showcasing a feature that depends on a certain setting, and that setting isn't set, then you should show a warning of some sort (implementation details left as an exercise for the developer).
can you share the os and browser versions? they're animated in Chrome 150 for me