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How do I simulate DOM based XSS?

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I have been tasked to do penetration testing on an in-house web application. I have to use OWASP ZAP penetration testing tool. This tool gave a report which says there is DOM based XSS vulnerabilities.

It gave a sample attack:

I would like to simulate this attack in the web browser since it is a GET request. What I did was to do an URL decode of the string after login_error=1, which gave me this:

and I appended it after login_error=1 in the address bar and hit enter. It did not popup an alert as I have hoped for.

Can anyone tell me how I could simulate this XSS?

Thanks in advance.
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