minimalistic headless WebKit-based with JavaScript API

 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 is an optimal solution for headless testing of web-based
 applications, site scraping, pages capture, SVG renderer, PDF converter
 and many other use cases.