Language of Page

Understanding WCAG2.0

By specifying the default language of the web page like <html lang="en"> by specifying HTML lang, the user agent and assistive technology can interpret the contents correctly.

When constructing a multilingual site, it is important to forget about this, so please be aware that even Japanese pages may be "en".

Also, when multiple languages are mixed within a single page, it is strongly recommended that consideration is also given to Success Criterion 3.1.2.

Principle Understandable Information and the operation of user interface must be understandable.
Guideline Readable Make text content readable and understandable.
Criterion Language of Page
(3.1.1 A)
Interpretation by program can be made as to which language the default natural language of each web page is.

URL of Techniques for WCAG 2.0