Add an event handler for the ContentLoading event. ContentLoading
triggers before any content is loaded, including scripts added with
AddScriptToExecuteOnDocumentCreated. ContentLoading does not trigger
if a same page navigation occurs (such as through fragment
navigations or history.pushState navigations). This operation
follows the NavigationStarting and SourceChanged events and precedes
the HistoryChanged and NavigationCompleted events.
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Add an event handler for the ContentLoading event. ContentLoading triggers before any content is loaded, including scripts added with AddScriptToExecuteOnDocumentCreated. ContentLoading does not trigger if a same page navigation occurs (such as through fragment navigations or history.pushState navigations). This operation follows the NavigationStarting and SourceChanged events and precedes the HistoryChanged and NavigationCompleted events.