IMSC Text Profile 1.3 is now a W3C Recommendation

The Timed Text Working Group is thrilled to announce the publication of IMSC Text Profile 1.3 as a W3C Recommendation. 

IMSC Text Profile 1.3 is the most recent addition to the IMSC family of specifications for the authoring and delivery of subtitles and captions worldwide. The rich styling and structured markup make it an ideal choice for expressive subtitles and AI training sets. 

This maintenance update improves on the IMSC 1.2 Text Profile by adding support for superscript and subscript text, and provides authoring guidelines for the Japanese language. The IMSC Hypothetical Render Model is also factored out as a separate Recommendation to ease future maintenance.