Set the Language of the Page

The default human language of each page must be set programmatically via the `lang` attribute. (WCAG 2.1 SC 3.1.1)

Why This Matters

Screen readers mispronounce content and braille translation fails when the language is unknown.

Use Semantic HTML Elements

Quality

Add Alt Text to Images

Quality

Ensure Keyboard Navigation

Quality

Maintain Color Contrast Ratio

Quality

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Assistive tech uses lang to pick the right pronunciation and braille tables. A missing or wrong value makes speech output garbled.

Good: <html lang="en">, with lang on inline passages in other languages. Bad: no lang attribute, so the screen reader guesses.