html to epub3 converter

I need a software to convert a webpage to epub3, in order to distribute the content offline, and, for example, deliver it trough email. The software must take in input the "save as web page, complete" as produced by chrome or firefox and package that content (included complicated js, mp3, svg) in a single epub3 file. The html is transitional and not strict. The produced epub3 must work on windows, osx, ios and android, that mean that the developer must indicate some reader that will read correctly the file on each os. The software may work online (eventually using as input the url of the web page to convert) or offline An example page to be converted is [login to view URL] each slide and mp3 included.