Indicating every language change is essential for readability and accessibility. It allows assistive technologies and text-to-speech software to select the appropriate voice and adjust pronunciation correctly, ensuring a better reading experience for everyone.

Objectives

• Ensure accurate speech or Braille output of the content.
• Ensure compliance with the typographical rules of the language being used.

Implementation

• Use the lang attribute on HTML tags to indicate a change of language within an EPUB file.

Control

• Check samples by inspecting the source code or by testing with a reading tool’s text-to-speech feature.
• Use language detection tools to automate the identification process.