Carlos: A browser does not an eBook reader make. Yes, most browsers have some support for HTML 5 but it is not nearly as homogenous as you make it sound. All are missing some features of HTML5. If you look at our wiki page for HTML5 you will see a link at the bottom that lets you test your browser for compliance with HTML5. This will not only test your browser but show you the conditions of various browsers. The PC ones are the most compliant while mobile browsers have a long way to go. Similarly for eBook readers using ePub3 the PC versions are ahead while the mobile versions tend to lag but for eBook Reading the mobile versions are the most used. If you look in our wiki under ePub 3 you will find a list of eBook readers that have some support specific to ePub 3 but again not all features are present.
In addition there are some copyright details to be worked out. Audio and Video formats are not all in the public domain and some of the most popular are patented so it is not clear is browsers like mosaic based ones and eBook Readers will ever support all the available formats. MP3 I believe will expire its patents soon and will thus become eligible but video patents have more time to run.
Dale
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