sublime key bind

gistfile1.txt

[
	// { "keys": ["ctrl+super+p"], "command": "swap_line_up" },
	// { "keys": ["ctrl+super+n"], "command": "swap_line_down" },
	// add to Preferences > Key Bindings - User
	// see http://stackoverflow.com/a/26619524 for context
	{ "keys": ["tab"], "command": "expand_abbreviation_by_tab",
	  "context": [
	    {
	      "operand": "source.js", 
	      "operator": "equal", 
	      "match_all": true, 
	      "key": "selector"
	    },
	    {   
	      "key": "selection_empty", 
	      "operator": "equal", 
	      "operand": true,
	      "match_all": true 
	    }
	  ]
	},
	{ "keys": ["tab"], "command": "next_field", "context":
	  [
	    { "key": "has_next_field", "operator": "equal", "operand": true }
	  ]
	}
]