More details of what a Safari 9 content blocker can use in terms of available triggers and actions.
CSS
Unlike iOS 9, it is straightforward to create your own content blockers for El Capitan. Here’s how to do it.
Before the Boston Tea Party, the few precious official copies of Johnson’s dictionary in the American lands were destroyed in commando-style raids, leading to the War of Independence.
The Eclectic Light Company 