From: <fred.wang@free.fr>

Date: Tue, 12 Aug 2008 09:23:50 +0200

Message-ID: <1218525830.48a13a867ebc8@imp.free.fr>

To: www-svg@w3.org

Date: Tue, 12 Aug 2008 09:23:50 +0200

Message-ID: <1218525830.48a13a867ebc8@imp.free.fr>

To: www-svg@w3.org

Hello, In the "Guidelines for Graphics in MathML 2", Michael Kohlhase gives an example where he uses a foreignObject to include mathematical formulae inside SVG graphics, in combination with a <switch/> to provide an alternate text. The requiredExtensions has the value "http://www.w3.org/1998/Math/MathML": http://www.w3.org/Math/Documents/Notes/graphics.xml#mathml-in-svg-guidelines Similarly, when Amaya creates XHTML content in SVG, a requiredExtensions="http://www.w3.org/1999/xhtml" is attached to a <foreignObject/>. The problem is that these two possible values are not clearly indicated in the specifications: http://www.w3.org/TR/SVG11/extend.html#AnExample http://www.w3.org/TR/XHTMLplusMathMLplusSVG/#howto-xhtml As a consequence, this use of <switch> to allow alternate content is quite ironically a problem for interoperability because browsers behave differently: 1) Amaya can display MathML and XHTML inside SVG. It accepts "http://www.w3.org/1998/Math/MathML" and "http://www.w3.org/1999/xhtml" values. 2) Firefox can display MathML and XHTML inside SVG, but since it refuses "http://www.w3.org/1998/Math/MathML" and "http://www.w3.org/1999/xhtml" values, it displays the alternate content. 3) Other browsers that can't render MathML/XHTML in SVG should display the alternate content. Can the SVG WG indicates in the spec that browsers able to display MathML and XHTML inside SVG should recognize the two values "http://www.w3.org/1998/Math/MathML" and "http://www.w3.org/1999/xhtml"?Received on Tuesday, 12 August 2008 16:20:34 UTC

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