CodeMirror: LESS mode

@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) { … }

html:lang(fr-be)

html:lang(de)

:lang(fr-be) > q

:lang(de) > q

tr:nth-child(2n+1) /* represents every odd row of an HTML table */

tr:nth-child(odd)  /* same */

tr:nth-child(2n+0) /* represents every even row of an HTML table */

tr:nth-child(even) /* same */

/* Alternate paragraph colours in CSS */

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; }

:nth-child(10n-1)  /* represents the 9th, 19th, 29th, etc, element */

:nth-child(10n+9)  /* Same */

:nth-child(10n+-1) /* Syntactically invalid, and would be ignored */

:nth-child( 3n + 1 )

:nth-child( +3n - 2 )

:nth-child( -n+ 6)

:nth-child( +6 )

html|tr:nth-child(-n+6)  /* represents the 6 first rows of XHTML tables */

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)