If you click on the first result for CWE-79, here is part of what you’ll see:
Keyword Search Results - CWE-79
The following steps assume you have the “Complete” button selected above the Description, to ensure you see all available weakness information in the CWE.
Note that “Cross-site Scripting” is in the name as well as breakdown of different types of XSS in the “Extended Description”. Also, under CWE-79’s title, it says “Usage for Mapping: Allowed (this CWE ID could be used to map to real-world vulnerabilities), as well as “Abstraction: Base”.