Alerts are pop-up windows that are implemented by a JavaScript function called Alert. This function is called from the onload section of HTML pages.
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The error detection mechanism detects any alert contained in a HTML response and treats it as being an error of SEVERITY_TRANS_EXIT severity. Known alerts that are to be ignored or reported with another severity can be specified in the AlertSeverities.csv file.
Alert messages are reported with the actual alert text, prefixed with the gsAlertMsgPrefix global variable. This variable contains an empty string by default, but can be assigned any value at anytime during script execution to meet your reporting needs.