WKUserScriptMBS.InjectionTimeAtDocumentEnd = 1

Type	Topic	Plugin	Version
const	WebKit2	MBS Mac64bit Plugin	19.5

One of the constants for the time when a user script should be injected into a webpage.

Inject the script after the document finishes loading, but before other subresources finish loading.

WKUserScriptMBS.InjectionTimeAtDocumentStart = 0

Type	Topic	Plugin	Version
const	WebKit2	MBS Mac64bit Plugin	19.5

One of the constants for the time when a user script should be injected into a webpage.

Inject the script after the document element is created, but before any other content is loaded.