CasperJS

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CasperJS http://casperjs.org/ is an open source navigation scripting & testing utility written in Javascript for the PhantomJS WebKit headless browser and SlimerJS (Gecko). It eases the process of defining a full navigation scenario and provides useful high-level functions, methods & syntactic sugar for doing common tasks such as:

   defining & ordering browsing navigation steps
   filling & submitting forms
   clicking & following links
   capturing screenshots of a page (or part of it)
   testing remote DOM
   logging events
   downloading resources, including binary ones
   writing functional test suites, saving results as JUnit XML
   scraping Web contents