ePub

An open standard file format for digital publications and documents, maintained by the W3C. ePub is significant for accessibility because it supports reflowable content that adapts to different screen sizes and user preferences, semantic markup through XHTML and CSS, and integration with assistive technologies including screen readers. The ePub 3 specification includes robust accessibility features such as MathML for mathematical notation, ARIA roles, and metadata for describing accessibility properties of publications.