[css-writing-modes] Mark at risk: ''sideways-left'' of 'text-orientation'

Author: Koji Ishii

css-writing-modes/Overview.bs

@@ -15,6 +15,7 @@ Former Editor: Shinyu Murakami, Antenna House, murakami@antenna.co.jp
 Former Editor: Paul Nelson, Microsoft, paulnel@microsoft.com
 Former Editor: Michel Suignard, Microsoft, michelsu@microsoft.com
 Abstract: CSS Writing Modes Level 3 defines CSS support for various international writing modes, such as left-to-right (e.g. Latin or Indic), right-to-left (e.g. Hebrew or Arabic), bidirectional (e.g. mixed Latin and Arabic) and vertical (e.g. Asian scripts).
+At Risk: The ''sideways-left'' of 'text-orientation'
 At Risk: The ''use-glyph-orientation'' of 'text-orientation'
 At Risk: The ''digits'' value of 'text-combine-upright'.
 At Risk: The look-ahead/look-behind sequencing rules for 'text-combine-upright'.