My target web application login page prompts "Invalid username or
password" in the form of dialog box (via javascript alert function)
whenever there is login failure. Form fill policy in access manager
allows me to configure page matching criteria to detect login failure.
However, in this scenario, page matching criteria will not work as error
message is delivered via javascript popup dialog box. Has anyone
encountered such web application ? How do I get around this without
changing the login page (this is off the shelf commercial web
application ? Thanks.

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