gecko-dev/layout/mathml/doc/Notes.txt

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/* ********************************************************************** */
/* Implementation of the MathML W3C REC http://www.w3.org/TR/REC-MathML */
/* Section 3. Presentation Markup
3.2 Token Elements
3.2.1 Attributes common to token elements
C- 3.2.2 <mi> -- identifier
C 3.2.3 <mn> -- number
C- 3.2.4 <mo> -- operator, fence, or separator
CSS 3.2.5 <mtext> -- text
3.2.6 <mspace/> -- space
CSS 3.2.7 <ms> -- string literal
3.3 General Layout Schemata
C 3.3.1 <mrow> -- horizontally group any number of subexpressions
C 3.3.2 <mfrac> -- form a fraction from two subexpressions
3.3.3 <msqrt> and <mroot> -- form a radical
3.3.4 <mstyle> -- style change
CSS 3.3.5 <merror> -- enclose a syntax error message from a preprocessor
3.3.6 <mpadded> -- adjust space around content
C 3.3.7 <mphantom> -- make content invisible but preserve its size
3.3.8 <mfenced> -- surround content with a pair of fences
3.4 Script and Limit Schemata
C 3.4.1 <msub> -- attach a subscript to a base
C 3.4.2 <msup> -- attach a superscript to a base
C 3.4.3 <msubsup> -- attach a subscript-superscript pair to a base
C 3.4.4 <munder> -- attach an underscript to a base
C 3.4.5 <mover> -- attach an overscript to a base
C 3.4.6 <munderover> -- attach an underscript-overscript pair to a base
C 3.4.7 <mmultiscripts> -- attach prescripts and tensor indices to a base
3.5 Tables and Matrices
CH 3.5.1 <mtable> -- table or matrix
CH 3.5.2 <mtr> -- row in a table or matrix
CH 3.5.3 <mtd> -- one entry in a table or matrix
3.5.4 <maligngroup/> and <malignmark/> -- alignment markers
3.6 Enlivening Expressions
3.6.1 <maction> -- bind actions to a subexpression
Table of argument requirements
------------------------------
tag number of children
------------------------------
<mrow> 0 or more
<mfrac> 2 (numerator denominator)
<msqrt> 1
<mroot> 2 (base index)
<mstyle> 1
<merror> 1
<mpadded> 1
<mphantom> 1
<mfenced> 0 or more
<msub> 2 (base subscript)
<msup> 2 (base superscript)
<msubsup> 3 (base subscript superscript)
<munder> 2 (base underscript)
<mover> 2 (base overscript)
<munderover> 3 (base underscript overscript)
<mmultiscripts> 1 or more
(base ( subscript superscript ) * [ <mprescripts/> ( presubscript
presuperscript ) * ])
<mtable> 0 or more rows (<mtr>s, inferred if necessary)
<mtr> 0 or more table elements (<mtd>s, inferred if necessary)
<mtd> 1
<maction> 1 or more (argument roles depend on actiontype attribute)
*/
/* NOTES:
Since frames are not refCounted, don't use nsCOMPtr with them
*/
#if 0
// NOTES ----
// border and padding -- study nsHTMLButtonControlFrame.cpp ...
// Text size infos
nsCOMPtr<nsIFontMetrics> fm;
aPresContext->GetMetricsFor(GetStyleFont()->mFont, getter_AddRefs(fm));
nsAutoString text;
fm->GetHeight([height]);
renderingContext->SetFont(fm);
renderingContext->GetWidth( text, [width] );
fm->GetMaxAscent( [baseline] );
fm->GetMaxDescent( [depth] );
#endif