Adding a web page as an icon to the menu, which will launch the browser and some page (app) in it is not really an example of HTML(5) based environment - by that account you can claim that even Maemo 5 with web page 'widgets' on the desktop was moving in that direction. Heck, you could claim that Windows 95 was moving in that direction with .url files/shortcuts linked to a browser.
... And what if you want to create your own browser (for whatever reason) on a platform that's HTML5-based? You'd be essentially writing a browser inside of a browser. Browserception?