Some people may tend to believe that web professionals recall every detail about the numerous technical specifications used online. Others may realize that the pastor in the local church does not recall be memory every scripture in the bible. The trick is to know what the information is and where the information is.
Heronote at https://code.google.com/p/heronote/ has about 150 ebooks and windows help files “chm” online. His work is a “must” for the library of anybody doing web development.