The content started arriving for a page load. The necessary transport requirements are established, and the load is being performed.
Load completed. All resources are done loading or there was an error during the load operation.
A provisional data source received a server redirect.
A new load request has been made. No data has been received yet, empty structures have been allocated to perform the load; the load may still fail due to transport issues such as not being able to resolve a name, or connect to a port.
Enum values used to denote the different events that happen during a #WebKitWebView load operation.