Automated scraping markup+CSS from a list of relevant URLs, using a variety of user-agent strings. Provides reporting on usage of CSS properties and apparent user-agent sniffing.
JavaScript Python Puppet Shell CSS Ruby
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Mozilla Spade

Spade is a data collection tool that scrapes CSS properties returned by sites given various user agent strings. The goal is to detect apparent user-agent sniffing and to generate reports on usage of CSS properties throughout the web.

Documentation is available at

Named after Sam Spade, the famous detective.