One of the weaknesses of mobile web browsers is the lack of a simple way to view a website's source information. Sure you could wait until you got home to examine how a site is built, but we live in the future. Waiting till we get home is very 2012. That's where Snoopy comes in.
Snoopy is a bookmarklet that allows you to quickly view source, giving you a look at the doctype, the JS libraries the page uses, what analytics are used, a look at the raw source of the page and a number of other finer details.
There are a few ways to get Snoopy to work in Mobile Safari. The simplest method is to simply drag the bookmarklet from the page, here, up to you