- From: John Hudson <tiro@tiro.com>
- Date: Fri, 30 Oct 2009 12:46:08 -0700
- To: fantasai <fantasai.lists@inkedblade.net>
- CC: "Martin J. Dürst" <duerst@it.aoyama.ac.jp>, Stephen Zilles <szilles@adobe.com>, Håkon Wium Lie <howcome@opera.com>, www-style <www-style@w3.org>, www-font <www-font@w3.org>
fantasai wrote: > Right. We don't have toggles. We do have presence=ON, absence=OFF for > many things. However, it seems we're dealing with a tri-state here, > not a boolean: ON, OFF, and DEFAULT. OpenType Layout features can be categorised as: On by default; cannot be turned off (e.g. <rlig> or the core Arabic and Indic script shaping features). On by default; can be turned off (e.g. <liga>) Off by default; can be turned on (e.g. <dlig> For those that can be turned on, most would be expected to be user-triggered, but some could be heuristically invoked. For example, the <case> feature might be triggered by all-caps setting. JH
Received on Friday, 30 October 2009 19:46:42 UTC