Unknown CSS :lang() Web Standard

Description

Unknown language in :lang() selector.

Help

Values in the :lang() selector should be valid BCP 47 language subtags.

Applicable standards

• CSS Validation

Change history

• 6.57 Jun 2025 Added.

This page describes a web site issue detected by SortSite Desktop and OnDemand Suite.

Rule ID: W3cCssBadSelectorLang