Don’t forget the lang attribute ✣ S.Bistrović

HTML hellbender says:

Don’t forget the lang attribute to define the default language.

And here’s why:

Screen readers use the lang attribute to pronounce words correctly and adjust voice settings, making content easier to understand.
Search engines like Google use the lang attribute to serve the right content to the right audience.
Browsers and translation tools rely on the lang attribute to identify the language and improve translations.
Some languages have specific hyphenation and formatting rules that work better when the correct language is set.
Standards like WCAG recommend defining the default language for better accessibility.

Here are some tips on defining the lang attribute.

Use simple codes like en for English, de for German, or fr for French to define the main language.
Use specific codes like en-GB for British English or en-US for American English to define regional differences.
If part of your content is in another language, wrap it in a tag with a different lang attribute:
<p lang="fr">Ce texte est en français.</p>