[millstone]

It's not useful to cast this in terms of standards. If your users use a non-standards compliant browser, you fix your website, not the browser.

With regard to your second paragraph, I believe you have made a category error between "the App Store" and "the browser." The browser is not a store.

[IggleSniggle]

The browser contains stores, and the browser can contain fully working applications. The point wasn’t that the browser is a store, but rather that allowing certain features to work on the web would destroy the walled garden of the App Store by enabling certain kinds of stores that circumvent the App Store.