PhantomJS is a headless WebKit with JavaScript API. It has fast and native support for various web standards: DOM handling, CSS selector, JSON, Canvas, and SVG.
PhantomJS gives you command-line access to the features of WebKit. According to its website: "Literally it acts like any other WebKit-based web browser, except that nothing gets displayed to the screen (thus, the term headless)." It has native support for DOM handling, CSS selector, JSON, Canvas, SVG, and JavaScript. You can use to test JavaScript, render Web pages as PDFs or perform more complex Web-based actions such as finding recent tweets by a particular Twitter user.
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