title: Load HTML page stored in IndexedDB
body: <p>I'd like to create a HTML app that stores another web page (HTML+CSS+JS in one file) in IndexedDB and can open it in the browser.</p>
  
  <p>I know that I can do it using File system API: create temporary file, write page content from DB to this file and change browser location to this file. But I read that Filesystem API is supported only by Chrome so I'm wondering if there is another approach, supported by standards?</p>