What is the maximum length allowed for window.returnValue property? (JavaScript)

Is there a maximum length when using window.returnValue (variant) in a modal? I am calling a modal window using showModalDialog() and returning a comma delimited string. After selecting a group of users, I am putting them into a stringbuilder to display in a literal. Dim strReturn As New StringBuilder strReturn.Append("") litReturnJavascript.Text = strReturn.ToString So would there be a limit on how many characters can be added to the window.returnValue?

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