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Re: [MathML4] thin, medium and thick values for mfrac@linethickness

From: Frédéric Wang <fwang@igalia.com>
Date: Fri, 22 Feb 2019 15:04:26 +0100
To: www-math@w3.org
Message-ID: <35546063-25eb-d3e4-ffd3-2090dee7c06c@igalia.com>
On 01/08/2016 18:02, Frédéric Wang wrote:
>
> Hi,
>
> The mfrac elements has values "thin", "medium" and "thick" which are
> "left up to the rendering agent". This is prone to inconsistencies
> between implementations. During Igalia's MathML refactoring, we
> aligned WebKit on Gecko's behavior. This is essentially what is
> suggested in the MathML in HTML5 implementation note and that should
> probably be included in an official MathML recommendation too:
>
> * The default linethickness "medium" is given by the
> FractionRuleThickness constant of the MATH table of the font used for
> the MathML rendering (see
> https://lists.w3.org/Archives/Public/www-math/2016Jul/0025.html for
> discussion about how to determine that font).
>
> * "thin" is 50% and "thick" is 200% of the default linethickness
> (these values are arbitrary and based on how it has been implemented
> in Gecko probably for more than 15 years).
>
> But are these keywords really used in practice? If not maybe you may
> be inclined to deprecate them too.
>
> Frédéric
>
Moved to https://github.com/mathml-refresh/mathml/issues/4

-- 
Frédéric Wang
Received on Friday, 22 February 2019 14:04:59 UTC

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