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Re: [css3-writing-modes] text-combine: cluster

From: John Daggett <jdaggett@mozilla.com>
Date: Mon, 25 Oct 2010 21:23:43 -0700 (PDT)
To: Koji Ishii <kojiishi@gluesoft.co.jp>
Cc: www-style list <www-style@w3.org>, Ambrose LI <ambrose.li@gmail.com>
Message-ID: <1492479566.181213.1288067023241.JavaMail.root@cm-mail03.mozilla.org>
Koji Ishii wrote:

> Text-combine:cluster represents a typeset feature to put several
> characters into 1em-box. There are some pre-composed Unicode code
> point for the common usage at:
> http://www.unicode.org/charts/PDF/U3300.pdf
> 
> As I guess from feature name, the font feature is to replace specific
> set of strings to one of the corresponding pre-composed letters. Am I
> correct?

Right, you're basically describing a ligature.  Fonts will support the
pre-composed versions using the codepoints you mention and some but
maybe not all via ligatures with the underlying character sequences.

Note that the explicitly designed version of these glyphs will always be
better, because they will be designed to work in an em-box the size of
the surrounding text.  An algorithmically generated version will be half
the size and will thus appear lighter.

John Daggett
Received on Tuesday, 26 October 2010 04:24:26 GMT

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