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One quick tip if you're torn between SlimerJS and PhantomJS.

Use http://casperjs.org scripts, and then choose the best engine at runtime.

For example, need screenshots? Tell CasperJS to use SlimerJS.

Looking for faster rendering to HTML? Tell CasperJS to use PhantomJS.

Quick nit: you can take screenshots with PhantomJS [0], exposed in casperjs as `capture` [1]

Quick nit: you can take screenshots with PhantomJS

Sorry, that's my fault for not going into more detail :)

The big issue I have with PhantomJ's screenshots is that it doesn't support web fonts, and so pages don't render correctly.

Just FYI, I found a script (typekit.js) that allowed me to get PhantomJS to render TypeKit fonts nicely: https://github.com/bramstein/phantomjs-typekit

Looks like web fonts work out of the box in phantomjs 2.0 (not released yet, but nightly source and binaries available): https://github.com/ariya/phantomjs/issues/10592

One quick tip if you're torn between SlimeJS and PhantomJS, do either of them or both at the same time, they expose the same* API.

* with minor changes, as documented with SlimerJS