A black terminal window will open in a new browser tab. Note that administrators can disable this feature; if the shortcut doesn't work, your access may be restricted. Method 1: Using the Crosh "Ping" Command
If you are simply typing unblock [website] into Crosh, it will not work. The network restrictions are usually handled at the router level or via enterprise policies that Crosh cannot override without higher permissions. how to use crosh to unblock websites