Notification size

Some developers using Chrome notifications have said that they would like to
be able to control the size of the notification bubble from the application.
 The use case here is a meeting reminder with potentially a lot of
information (location, people attending, etc.) that the application wants to
make available at a glance inside the notification.

It would certainly be difficult (perhaps impossible) to apply a size request
to text+icon notifications which are being displayed through a platform
notification service, but might apply to HTML notifications.

I have concerns that arbitrary sizing decided by the application would move
notifications beyond the primary goal of passive alerting, but wanted to ask
the WG about it -- other thoughts on how to address this use case?

A possible alternative would be a resize() method that could only be invoked
on a user gesture, so a notification could be expanded on click.

Thanks,
 -John