[css3-writing-modes] horizontal-bt writing mode

Looking over the current CSS3 Writing Modes spec, I'm puzzling over what
writing-mode 'horizontal-bt' is needed for?  It's defined as:

  "Bottom-to-top block flow. The writing mode is horizontal."

What's the script that requires this?  Or is it just there for
completeness?

  http://dev.w3.org/csswg/css3-writing-modes/#writing-mode

John Daggett

Received on Monday, 25 October 2010 07:06:06 UTC