The lang Attribute
The language of the document can be declared in the tag.
The language is declared with the lang attribute.
Declaring a language is important for accessibility applications (screen readers) and search engines:
<!DOCTYPE html>
<html lang="en-US">
<body>
...
</body>
</html>
The first two letters specify the language (en). If there is a dialect, use two more letters (US).
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