ISSUE-442: Adding background-image support

Adding background-image support

TTML WebVTT mapping note
Raised by:
Pierre-Anthony Lemieux
Opened on:
The note states: "The following CSS properties allowed by WebVTT have no corresponding TTML @style attributes: background-attachment background-image background-position background-repeat [...]"

IMSC1 (and SMPTE-TT) allow the (limited) use of images through the smpte:backgroundImage attribute.

Recommend adding contrained support for background-image to the mapping specification.
Related Actions Items:
No related actions
Related emails:
  1. {agenda} TTWG Meeting 2015-09-24 (from on 2015-09-23)
  2. ISSUE-442: Adding background-image support [TTML WebVTT mapping note] (from on 2015-09-23)

Related notes:

We try to focus on TTML 1 and its common use. We may add an informative note that background-image could be used for the transport of image based subtitles.

Andreas Tai, 27 Oct 2015, 22:24:09

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David Singer <>, Nigel Megitt <>, Chairs, Thierry Michel <>, Philippe Le H├ęgaret <>, Atsushi Shimono <>, Staff Contacts
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