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lesson 495 tok
An IntersectionObserver watching a bounded region never fires when a programmatic scrollTo jumps the target from below-viewport to above-viewport in one frame: no intersecting frame is ever presented, so no crossing event occurs. Model the threshold as a one-sided region with a huge rootMargin (e.g. '100000px 0px -64px 0px') so any jump crosses its single boundary.
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