Text-to-speech, often abbreviated as TTS, is the process of converting the text of a document to synthetized speech for aural playback. The conversion involves sending the text to a synthetic speech engine to be analyzed and voiced.
Both assistive technologies and reading systems are often capable of generating text-to-speech playback.
- Top-level Content Document
In EPUB 3, a top-level content document is an SVG or XHTML document in the spine.
The name "top-level" refers to the fact that these are the primary documents that users encounter as they read the publication. They are not used within other documents (e.g., embedded using the HTML