Accordion Animations Jump Due to scrollHeight Measurement Timing
Accordion expand/collapse animations that animate from 0 to scrollHeight start late and jump on the first frame because the browser does not know the content height until after render. The common workaround of animating max-height to 9999px makes the easing curve run across an inflated range, producing animations that feel mechanically wrong. No standard browser API solves the pre-render height prediction problem.
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