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Fixes #1340 - make TTMLParser more permissive of non-EBU-TT-D

Vinay Rosenberg requested to merge github/fork/davemevans/MakeTTDParserMorePermissive into development

Created by: davemevans

Two problems were found in #1340 (closed):

  • if no tts:origin was set, the default values for top and left would attempt to place the text near the bottom. Set them to auto as specified in TTML1. @TobbeEdgeware, @nigelmegitt - do you agree this is sensible (esp. given that all compliant EBU-TT-D will have origin set)?
  • even if tts:origin (or any other region-specific styling) was specified, this was only honoured if found as an inline attribute of region, as required by EBU-TT-D. This constraint is not applicable for TTML, so made parsing of referenced styles on regions more lenient (ie allowed region-specific styling non-inline).

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