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tests that are invalid because of dependence on subpixel metrics of Ahem font

From: L. David Baron <dbaron@dbaron.org>
Date: Wed, 17 Nov 2010 10:36:20 -0800
To: public-css-testsuite@w3.org
Message-ID: <20101117183620.GA32467@pickering.dbaron.org>
As I mentioned at the face-to-face meeting (see
http://lists.w3.org/Archives/Public/www-style/2010Nov/0240.html ), I
believe a significant number of tests are invalid because they use
the Ahem font at sizes that are not a multiple of 5 pixels.  This
means that important metrics such as ascent, descent, and x-height
are not integral numbers of pixels.  Different platforms tend to
perform rounding differently.

See the following bug reports for extended discussion of issues on
Linux:
https://bugzilla.mozilla.org/show_bug.cgi?id=604836
https://bugzilla.mozilla.org/show_bug.cgi?id=611780

This affects the following tests:

html4/c43-rpl-bbx-002.htm
xhtml1/c43-rpl-bbx-002.xht
html4/c43-rpl-ibx-000.htm
xhtml1/c43-rpl-ibx-000.xht
html4/c548-leadin-000.htm
xhtml1/c548-leadin-000.xht
html4/c548-ln-ht-002.htm
xhtml1/c548-ln-ht-002.xht
html4/c526-font-sz-002.htm
xhtml1/c526-font-sz-002.xht
html4/first-line-pseudo-013.htm
xhtml1/first-line-pseudo-013.xht
html4/first-line-pseudo-014.htm
xhtml1/first-line-pseudo-014.xht
html4/first-line-pseudo-015.htm
xhtml1/first-line-pseudo-015.xht
html4/first-line-pseudo-016.htm
xhtml1/first-line-pseudo-016.xht
html4/inline-formatting-context-022.htm
xhtml1/inline-formatting-context-022.xht
html4/inline-non-replaced-height-002.htm
xhtml1/inline-non-replaced-height-002.xht
html4/inline-non-replaced-height-003.htm
xhtml1/inline-non-replaced-height-003.xht
html4/letter-spacing-043.htm
xhtml1/letter-spacing-043.xht
html4/letter-spacing-044.htm
xhtml1/letter-spacing-044.xht
html4/margin-collapse-154.htm
xhtml1/margin-collapse-154.xht
html4/max-height-108.htm
xhtml1/max-height-108.xht
html4/outline-019.htm
xhtml1/outline-019.xht
html4/outline-020.htm
xhtml1/outline-020.xht
html4/units-001.htm
xhtml1/units-001.xht
html4/units-004.htm
xhtml1/units-004.xht
html4/vertical-align-121.htm
xhtml1/vertical-align-121.xht
html4/vertical-align-applies-to-008.htm
xhtml1/vertical-align-applies-to-008.xht
html4/vertical-align-applies-to-009.htm
xhtml1/vertical-align-applies-to-009.xht
html4/vertical-align-applies-to-010.htm
xhtml1/vertical-align-applies-to-010.xht
html4/vertical-align-applies-to-011.htm
xhtml1/vertical-align-applies-to-011.xht
html4/vertical-align-applies-to-012.htm
xhtml1/vertical-align-applies-to-012.xht
html4/vertical-align-applies-to-013.htm
xhtml1/vertical-align-applies-to-013.xht
html4/vertical-align-applies-to-014.htm
xhtml1/vertical-align-applies-to-014.xht
html4/vertical-align-applies-to-015.htm
xhtml1/vertical-align-applies-to-015.xht
html4/white-space-collapsing-001.htm
xhtml1/white-space-collapsing-001.xht
html4/white-space-collapsing-002.htm
xhtml1/white-space-collapsing-002.xht
html4/white-space-processing-043.htm
xhtml1/white-space-processing-043.xht
html4/white-space-processing-044.htm
xhtml1/white-space-processing-044.xht
html4/white-space-processing-045.htm
xhtml1/white-space-processing-045.xht

-David

-- 
L. David Baron                                 http://dbaron.org/
Mozilla Corporation                       http://www.mozilla.com/
Received on Wednesday, 17 November 2010 18:36:50 GMT

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