PhantomJS is an optimal solution for:
Headless Website Testing: Run functional tests with frameworks such as Jasmine, QUnit, Mocha, Capybara, WebDriver, and many others.
Screen Capture: Programmatically capture web contents, including SVG and Canvas. Create web site screenshots with thumbnail preview.
Page Automation: Access and manipulate webpages with the standard DOM API, or with usual libraries like jQuery.
Network Monitoring: Monitor page loading and export as standard HAR files. Automate performance analysis using YSlow and Jenkins.