Need to change the following:
"MUST provide a mechanism that allows a developer to indicate that the
application is able to function as standalone. If no such indication is
given by the developer, then the application MUST launch in the Web
browser as normal. That is, the solution MUST NOT conflate bookmarking
with allowing a web application to be launched as standalone. "
... to make it clear that it's actually a user's decision, but the manifest format needs to give the developer control over some start-up options for standalone.