Verification includes real Chrome playback/fullscreen/captions, mode preservation, exact chapter seeking, actual loop repetition/reset, native playback rates, keyboard focus/Escape, 320/360/768/1280px layouts, forced colors and reduced motion. Touch used trusted Chrome emulation; physical handset, screen-reader, Safari and Firefox checks have not run. No WCAG certification is claimed. A public clean clone passed npm ci, typecheck, lint and build.