text-orientation: sideways-left and sideways in CSS Writing Modes Level 3


  1. sideways-left is not implemented yet
    • sideways-left is for Latin and other non-East Asian vertical flow, while other values (mixed, upright, sideways-right) are important values for East Asian vertical flow.
  2. sideways has dependency on sideways-left, and thus is implemented differently from the spec by 3 implementations (AH, Blink, WebKit)
    • Mongolians must use sideways-right, not sideways, but the 3 implementations allow both.



  1. Keep as is
  2. Mark at risk and put a note for attention not to implement the sideways value if you don't implement this value
  3. Defer to Level 4


  1. Keep as is
  2. Mark at risk and put a note for attention not to implement this value differently from the spec
  3. Change the spec to follow the interoperable 3 implementations (same behavior as sideways-right)
  4. Defer to Level 4


  1. Concerns of the value could prevent the property from being implemented because of its complexity.
  2. IIUC, design concerns were raised 2-3 times before at F2F and offline, though I could not find them in the minutes.
  3. IE is the only UA that supports the use case (though using the writing-mode properly, not the text-orientation property.)
  4. EPUB 3 CSS Profile refers to this property.
spec/css3-writing-modes/sideways-left.txt · Last modified: 2015/02/08 08:56 by kojiishi
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