Deletion of CSE HTML Validator

Comment: Okay, I'm satisfied by the ''https://books.google.com/books?id=j84aAgAAQBAJ&pg=PT464&dq=CSE+HTML+Validator&hl=en&sa=X&ei=ZiYQVZm6FIe1ggTNvoKYBA&ved=0CDQQ6AEwAw#v=onepage&q=CSE%20HTML%20Validator&f=false WordPress 3 Search Engine Optimization'' and ''https://books.google.com/books?id=UNdGyEGZ1SkC&pg=PA286&dq=CSE+HTML+Validator&hl=en&sa=X&ei=ZiYQVZm6FIe1ggTNvoKYBA&ved=0CDoQ6AEwBA#v=onepage&q=CSE%20HTML%20Validator&f=false HTML in 10 Simple Steps or Less'' sources.   requires only that multiple reliable independent secondary sources exist, not that they must be cited in the article (which these aren't).  This establishes notability, which is pretty much all we consider at AfD.  Everything else is content, for discussion somewhere else
Stance: keep
Cited policy: Wikipedia:Notability (WP:GNG)