Update. 2021-01-28
The Onload Event verification operation is based on the javascript "document.readyState".
For more detailed information, please refer to https://www.w3schools.com/jsref/prop_doc_readystate.asp
Onload Event keeps monitoring the return value of the javascript "document.readyState" for the duration of "Timeout" value set in the STU parameter.
It is designed to yield "Success" when "Complete" has been returned to the javascript within the timeout value, otherwise it yields "Failure".
Onload Event must be used with Open Browser.
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It is a verification operation that waits until detection of the Onload Event message.