What is a valid language code?
Valid language codes are either two-letter or three-letter language codes. You can find the list of valid language codes in the ISO 639-1 code list.
For english this would be
<html lang="en"> <!-- content --> </html>
Why is this important?
The language of a page is used by screen readers to speak the content of the page in the correct language.
Checkout the language check for other reasons why the language attribute is important.
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