List runtime features with "--list-runtime-features" from the command line.

Output looks like this : 

Available runtime features flags : 
  Command Line Switch                Description                                                                    Status       
----------------------------------------------------------------------------------------------------------------------------------------------------------
  --disable-raw-sockets                 JavaScript support for using TCP and UDP sockets           Stable
  --disable-device-capabilities        JavaScript support for peeking at device capabilities          Stable
  --enable-dialog                           JavaScript support to create open/save native dialogs        Experimental