Usecase:

"With use of text-to-speech on the rise in mainstream use-case scenarios such as smart
speakers (Amazon Echo, Google Home), multimodal interaction on smart phones and in-car systems, there is a need for authors and publishers to be able to easily call out portions of a Web page that are particularly appropriate for reading out aloud. Such read-aloud functionality may
vary from speaking a short title and summary, to speaking a few key sections of a page; in some cases, it may amount to speaking most non-visual content on the page. "

A vocab draft:

• http://pending.webschemas.org/speakable
• http://pending.webschemas.org/SpeakableSpecification
• http://pending.webschemas.org/cssSelector
• http://pending.webschemas.org/xpath