Depends. Are you asking if I can make a web app from memory? Probably not. I have ebooks, I have my Dash app which downloads documentation. So while, I could

Depends. Are you asking if I can make a web app from memory? Probably not. I have ebooks, I have my Dash app which downloads documentation. So while, I could technically do it without Googling, I can't do it without documentation. If I can't Google then I'd have to look at documentation and my ebooks. Why? Well, I work with a lot of languages and frameworks. I can't commit all these technologies to memory. Few could.