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Probably? I'll counter with very unprobably. It's mostly a blur effect and the amount it shifts is very small.

Edit: I hope whoever downvoted has actual evidence of danger.

Also the danger range is generally around 12-20Hz and that background is at 4.

I don't care if it's dangerous. It's annoying and makes me feel uneasy. Had to block it with ublock.

I was wondering what you were referring to (later comments clarified this).

Once again, I'm happy that I don't allow scripting to run in my browser by default -- I never saw the effect you are talking about.

Just to be clear, there's no scripting involved, it's a plain image file set as the page's background.

Interesting. Then I can't explain why I don't see the effect.

No idea.