Cabecera: header

• h1{color: grey}=0,0,0,1
• #caja h1{color:blue;} h1=0,1,0,1
• .cabecera h1{color: green}=0,0,1,1
• #caja header h1{color: red;}=0,1,0,2
• .cabecera header h1=0,0,1,2