У вашего броузера проблема в совместимости с HTML5
labsystem offers ePub export. The ePubs (including a graphical cover) are automatically getting generated using your contents. You do not have to do more than enabling the feature for your students. Using the ePub students get a course book for convenient offline reading using all the comfort of an ePub reader. The ePubs can be directly used on iOS devices. For Android devices and Kindles the format can be easily converted to .mobi etc. using free tools like calibre. The ePub is always individually created for the downloader. It contains only the currently accessible course materials. The imprint and the preface can be easily configured via the config file from within the system. Individual modules and whole courses can be "ePub-ified".