:lang() pseudo-class was introduces in CSS2. Level 4 selectors adds wildcard matching. The language pseudo-class represents an element that is in one of the languages listed as an argument.
In CSS2, wildcard matching is not possible. Level 4 selectors adds wildcards.
/* Where this matches anything ending in "*-CA". */
/* The following example matches all p elements with a lang attribute ending in -CA (en-CA, fr-CA). */
Information is based on Selectors Level 4 - W3C Working Draft (last updated on May 2, 2013)
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