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ILoadHandlerOnFrameLoadStart Method
Version 51.0.0
Called when the browser begins loading a frame. The Frame value will never be empty Check the IsMain method to see if this frame is the main frame. Multiple frames may be loading at the same time. Sub-frames may start or continue loading after the main frame load has ended. This method may not be called for a particular frame if the load request for that frame fails. For notification of overall browser load status use OnLoadingStateChange(IWebBrowser, LoadingStateChangedEventArgs) instead. This method will be called on the CEF UI thread. Blocking this thread will likely cause your UI to become unresponsive and/or hang.

Namespace: CefSharp
Assembly: CefSharp (in CefSharp.dll) Version: (
void OnFrameLoadStart(
	IWebBrowser browserControl,
	FrameLoadStartEventArgs frameLoadStartArgs


Type: CefSharpIWebBrowser
The IWebBrowser control this popup is related to.
Type: CefSharpFrameLoadStartEventArgs
Whilst thist may seem like a logical place to execute js, it's called before the DOM has been loaded, implement OnContextCreated(IWebBrowser, IBrowser, IFrame) as it's called when the underlying V8Context is created (Only called for the main frame at this stage)
See Also