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Polyglot Guidance for HTML5 Foreign Content Exceptions

From: Tony Ross <tross@microsoft.com>
Date: Mon, 21 Jun 2010 18:41:08 +0000
To: "public-html@w3.org" <public-html@w3.org>
CC: Eliot Graff <eliotgra@microsoft.com>
Message-ID: <0BE6C9F65034784C8E2852B6F303DA173B5AADE8@TK5EX14MBXC119.redmond.corp.microsoft.com>
The "in foreign content" insertion mode section of the HTML5 spec has some additional exceptions we should probably account for in the polyglot spec (http://dev.w3.org/html5/spec/Overview.html#parsing-main-inforeign).

1) The list of conditions causing a switch to secondary insertion mode (children of <foreignObject>, <desc>, etc.)
2) The list of elements forcing a foreign content section to close (<b>, <big>, etc.)

For (1), I suggest we state that the XHTML namespace must be explicitly declared on children of <foreignObject>, <desc>, etc. unless the child is a <math> or <svg> element. This would require removing/rewording the statement in section 5 indicating that no elements other than <html>, <svg>, and <math> should have namespace declarations. The listed cases for MathML elements would need to be handled in the same manner unless the child element is <mglyph> or <malignmark>, in which case no additional namespace declaration is necessary. The condition for <svg> inside <annotation-xml> would not need to be mentioned as the polyglot spec already requires that all <svg> elements have an explicit SVG namespace declaration.

For (2), I suggest stating that elements such as <b>, <big>, etc. must only be used as children of HTML elements. The <font> element would be an exception so long as it does not have any of the attributes "color", "face", or "size".

Received on Monday, 21 June 2010 18:41:44 UTC

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