SWebBrowser ExecuteJavascript

Has anyone played around with the SWebBrowser class?
My question is about the ExecuteJavascript function. Is it blocking or asynchronous? I can’t find any information.
Can I process data produced by the called JS script immediately or do I have to wait and synchronize it myself?

The ExecuteJavascript function in the SWebBrowser class is asynchronous.

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