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Re: text-align-07-t pass criteria

From: Cameron McCormack <cam@mcc.id.au>
Date: Tue, 14 Dec 2010 21:34:51 +1300
To: Chris Lilley <chris@w3.org>
Cc: public-svg-wg@w3.org
Message-ID: <20101214083450.GE4641@wok.mcc.id.au>
Cameron McCormack:
> > So that means the reference image is incorrect, yes?

Chris Lilley:
> Yes.

So I’ve come back to looking at this test, and I am not sure that the
pass criteria are valid or that the reference image is incorrect after
all.  Here is a passage from text.html#FontsTablesBaselines:

  For example, Western glyphs are aligned on the bottoms of the capital
  letters, northern indic glyphs are aligned at the top of a horizontal
  stroke near the top of the glyphs and far-eastern glyphs are aligned
  either at the bottom or center of the glyph. Within a script and
  within a line of text having a single font-size, the sequence of
  alignment-points defines, in the inline-progression-direction, a
  geometric line called a baseline. Western and most other alphabetic
  and syllabic glyphs are aligned to an "alphabetic" baseline, the
  northern indic glyphs are aligned to a "hanging" baseline and the
  far-eastern glyphs are aligned to an "ideographic" baseline.

The key here is "within a line of text having a single font-size".  The
need to have a single font size for baseline alignment is mentioned in
the text.html#FontsTablesBaselines section too.

So I would suggest either dropping text-align-07-t and text-align-08-b
back to unapproved for now, or editing them to use the correct baselines
(if people are amenable to the test being changed at this late stage).

-- 
Cameron McCormack ≝ http://mcc.id.au/
Received on Tuesday, 14 December 2010 08:35:30 GMT

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