Cabecera: header
html body header h1 {color: yellow; } {0,0,0,4}
body header h1 {color: purple;} {0,0,0,3}
#caja header h1 {color: red;} {0,0,1,2}
#caja .cabecera h1 { color: blue; } {0,1,1,1}
header h1 { color: black; } {0,0,0,2}
h1{ color: lime;} {0,0,0,4}