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Firefox 4: the HTML5 parser—inline SVG, speed and more. A complete replacement for the oldest part of Gecko (the HTML parser dates back to 1998) headed up by HTML5 validator author Henri Sivonen, using the parsing algorithm defined in the HTML5 specification. Improvements include parsing taking place off the main UI thread and the ability to embed SVG and MathML directly inline in HTML pages. # 12th May 2010, 8:56 am
HTML 5 Parsing. Firefox nightlies include a new parser that implements the HTML5 parsing algorithm (disabled by default), which uses C++ code automatically generated from Henri Sivonen’s Java parser first used in the HTML5 validator. # 11th July 2009, 11:36 pm
There are two meanings to XHTML: technical and marketing. The technical kind (XHTML served using the application/xhtml xml MIME type) is a formulation of HTML as an XML vocabulary. The marketing kind (XHTML served using the text/html MIME type) is processed just like HTML by browsers but the authors attempt to observe slightly different syntax rules in order to make it seem that they are doing something newer and shinier compared to HTML.
An Unnofficial Q&A about the Discontinuation of the XHTML2 WG. By Henri Sivonen. # 6th July 2009, 12:27 pm
Draconian failure on error is not the answer problems of Postel’s law. Draconian error handling creates an unstable equilibrium in Game Theory terms —it only lasts until one player breaks the rule. One non-Draconian XML5 implementation in key client product and the Draconian XML ranks would break. Well-specified error recovery is the right way to implement the liberal part of Postel’s law.