I noticed that when I tried to view the HTML versions of a few gitbooks.io documents, that the contents of the pages disappear as I scroll down the pages. When you initially browse to a page, you can see some content. Other browers (Safari for iOS, Firefox for Linux desktop, etc.) do not seem to have the problem. As an example, try to view the following gitbook.io book in HTML form and scroll down the page: https://astaxie.gitbooks.io/build-web-application-with-golang/content/en/ If you refresh the page, the content will come back. Thanks for all of the hard work!