javascript - XSS Payload not working - Stack Overflow

I am learning Website Pen-testing and trying to find XSS vulnerability.I use Firefox Browser. Here is the site's code for search bar: My payload is : a" onmouseover="ALeRT(X)" size="50 which mak

An example of stack overflow. (a) shows the source code of example. The

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Is there an XSS vulnerability in Stack Overflow