0.8×1×1.2×1.5×1.7×2×2.5×9 min⚡️11 min8 min 55 sec7 min 26 sec5 min 57 sec5 min 15 sec4 min 27 sec3 min 34 secIntroduction to Visibility Challenge0.8×1×1.2×1.5×1.7×2×2.5×9 min⚡️11 min8 min 55 sec7 min 26 sec5 min 57 sec5 min 15 sec4 min 27 sec3 min 34 secIntroduction to Visibility ChallengeYour user agent does not support the HTML5 Video element.