They just wait around for the page to change a bit and once it's done (after some timeout) then it takes what's currently on the DOM as being the actual page. T

They just wait around for the page to change a bit and once it's done (after some timeout) then it takes what's currently on the DOM as being the actual page. This is then sent back, analysed and parsed as the content. Similar to how phantomjs does page rendering with timeout..