@media screen and (device-aspect-ratio: 16/9) { … }
@media screen and (device-aspect-ratio: 32/18) { … }
@media screen and (device-aspect-ratio: 1280/720) { … }
@media screen and (device-aspect-ratio: 2560/1440) { … }
p:nth-child(4n+1) { color: navy; }
p:nth-child(4n+2) { color: green; }
p:nth-child(4n+3) { color: maroon; }
p:nth-child(4n+4) { color: purple; }
img:nth-of-type(2n+1) { float: right; }
img:nth-of-type(2n) { float: left; }
body > h2:nth-of-type(n+2):nth-last-of-type(n+2)
body > h2:not(:first-of-type):not(:last-of-type)