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http://dev.w3.org/csswg/selectors4/#the-lang-pseudo It looks like this was once xref'd, but no longer.
Tab, which URL should we use? Is http://dev.w3.org/csswg/selectors4/#the-lang-pseudo OK?
Use http://dev.w3.org/csswg/selectors/#the-lang-pseudo so it's not version-specific. We'll probably start publishing Selectors 5 later this year, and ideally it'd point to the newest spec. ^_^
https://github.com/w3c/webvtt/commit/cca1105e75f5da2a8b565830397b25a7b2d38dff (If the url is wrong, blame Tab!)