[API categories](API-categories.md) | [API index](API-index.md) # JavascriptContextHandler (interface) Implement this interface to handle javascript exceptions globally. For an example of how to implement handler see [cefpython](cefpython.md).CreateBrowser(). For a list of all handler interfaces see [API > Client handlers](API#Client_handlers). Table of contents: * [Callbacks](#callbacks) * [OnContextCreated](#oncontextcreated) * [OnContextReleased](#oncontextreleased) ## Callbacks ### OnContextCreated | Parameter | Type | | --- | --- | | browser | [Browser](Browser.md) | | frame | [Frame](Frame.md) | | __Return__ | void | Called shortly after (process message delay) the V8 context for a frame has been created. If the page does not contain `