The Timed Text Working Group invites implementations of an updated Candidate Recommendation of TTML Profiles for Internet Media Subtitles and Captions 1.1. This specification defines two profiles of [ttml2-20180628]: a text-only profile and an image-only profile. These profiles are intended to be used across subtitle and caption delivery applications worldwide, thereby simplifying interoperability, consistent rendering and conversion to other subtitling and captioning formats. This specification improves on [ttml-imsc1.0.1] by supporting contemporary practices, while retaining compatibility with [ttml-imsc1.0.1] documents. Relative to [ttml-imsc1.0.1], any addition or deprecation of features are summarized at Appendix L. Summary of substantive changes (non-normative).