I am migrating a site from SP2010 to SP2013. The old site is not built by me so I am not familiar with the old design.
When I "view source" the page some JS files (include abc.js) are include. When I edit the page, there is a Content Editor webpart named "JS". When I look into it it is blank. The JS files are not included in Master page, too.
I have open the source code with VS2010. By search keyword "abc.js" for entire solution there is nothing.
What could be the trick? Sorry I am not a developer.