  Quality of Experience (QoE) for various types of websites has gained
significant attention in recent years. In order to design and evaluate
websites, a metric that can estimate a user's experienced quality robustly for
diverse content is necessary. SpeedIndex (SI) has been widely adopted to
estimate perceived web page loading progress. It measures the speed of
rendering pixels for the webpage that is visible in the browser window. This is
termed Above-The-Fold (ATF). The influence of animated content on the
perception of ATF has been less comprehensively explored. In this paper, we
present an experimental design and methodology to measure ATF perception for
websites with and without animated elements for various page content
categories. We found that pages with animated elements caused people to have
more varied perceptions of ATF under different network conditions. Animated
content also impacts the page load estimation accuracy of SI for websites. We
discuss how the difference in the perception of ATF will impact the QoE
management of web applications. We explain the necessity of revisiting the
visual assessment of ATF to include the animated contents and improve the
robustness of metrics like SI.
