Flying Saucer (https://xhtmlrenderer.dev.java.net/ https://xhtmlrenderer.dev.java.net/) is a pretty badass solution for what you want. It's a Java library, but

Flying Saucer (https://xhtmlrenderer.dev.java.net/ https://xhtmlrenderer.dev.java.net/) is a pretty badass solution for what you want. It's a Java library, but you can use it in Ruby or any other language that runs on the JVM pretty easily.