Pseudoklasa :lang pozwala na dopasowanie własności dla elementów w określonym języku. W HTML4 odnosi się do atrybutu lang. W XML-u do xml:lang.
selektor:lang(symbol) { własności }
Gdzie symbol to symbol języka zgodny z
p:lang(pl) {własności }
Zostaną zastosowane własności dla wszystkich elementów P, których atrybut lang ustawiony jest na pl.
:active:any [Translate]:any-link [Translate]:checked [Translate]:default [Translate]:dir() [Translate]:disabled [Translate]:empty:enabled [Translate]:first [Translate]:first-child:first-of-type [Translate]:fullscreen [Translate]:focus [Translate]:focus-within [Translate]:hover [Translate]:indeterminate [Translate]:in-range [Translate]:invalid [Translate]:lang:last-child:last-of-type [Translate]:left [Translate]:link:not:nth-child() [Translate]:nth-last-child() [Translate]:nth-last-of-type() [Translate]:nth-of-type() [Translate]:only-child [Translate]:only-of-type [Translate]:optional [Translate]:out-of-range [Translate]:placeholder-shown [Translate]:read-only [Translate]:read-write [Translate]:required [Translate]:right [Translate]:root:scope [Translate]:target [Translate]:valid [Translate]:visited [Translate]::-moz-progress-bar [Translate]::-moz-range-progress [Translate]::-moz-range-thumb [Translate]::-moz-range-track [Translate]::-ms-fill [Translate]::-ms-fill-lower [Translate]::-ms-fill-upper [Translate]::-ms-thumb [Translate]::-ms-track [Translate]::-webkit-progress-bar [Translate]::-webkit-progress-value [Translate]::-webkit-slider-runnable-track [Translate]::-webkit-slider-thumb [Translate]:after::backdrop [Translate]:before::cue (:cue) [Translate]:first-letter::first-line (:first-line) [Translate]::grammar-error [Translate]::placeholder [Translate]::selection [Translate]::spelling-error [Translate]