Default values for things that are accessible through the API are now controlled by the Widgets API spec.
The "default value" column of the "Table of Configuration Defaults"
doesn't map, nor should it map, to the underlying implementation of user
agent (i.e., it does not map to C or Java, as there is no notion of a
"null" in some languages.... and these specs are not implemented in
JavaScript). Hence I removed them because it was causing confusion.
