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On my iPhone, the one that says direction="down" behavior="alternate" doesn't bounce up and down; it bounces horizontally.

Yeah it doesn't seem to handle nested marquees, only respecting the inner one...

Oh, I guess the intended behavior is for it to bounce like the DVD logo.

An example, which sounds like it won't work on iOS.

Correct. Works fine on Chrome/Firefox on macOS. Though, I notice that the animation on Firefox isn't smooth.