This could be especially useful for creating killer screen shots for your link bait: 7. PageDiff allows to compare HTML code differences of several pages side by side: ...

Summary – It’s in the Code Hopefully you now understand the importance of why your source code matters for SEO. When performing SEO audits, you’ll find yourself neck deep in the code at some point.

Factoring common JSP or HTML code out of multiple pages and into a single file improves maintainability (you need to make changes in only one location) and reusability.

Look for a menu option that has the word "Source" in it, such as "View Page Source." Select that option to view a window that displays the page's HTML source code.