The lang attribute is an essential component in the basic structure of an HTML document. It’s important that we define it correctly because it affects many aspects of user experience. Unfortunately, the negative effects a missing or wrong attribute can have aren’t always evident. Austrian news site orf.at learned that the hard way recently.
In the first article of this series, I explained how important progressive enhancement is for web accessibility. Building websites layer by layer allows for a cleaner separation of concerns and more resilient experiences. This second article is about user preferences and how to respect them when writing CSS.