https://timeline.knightlab.com/?utm_campaign=elearningindustry.com&utm_source=%2Ftop-10-free-timeline-creation-tools-for-teachers&utm_medium=link#overview
사용법
https://timeline.knightlab.com/?utm_campaign=elearningindustry.com&utm_source=%2Ftop-10-free-timeline-creation-tools-for-teachers&utm_medium=link#make
https://cdn.knightlab.com/libs/timeline3/latest/embed/index.html?source=1blpwOpGeXD9EtNd3CLEK3U0b4anqguuVse0vj6SLECY&font=Default&lang=en&initial_zoom=2&height=650