MathML:Open Type MATH Table

References

• Latest Specification (section 6.3.6) ; ISO/IEC 14496-22:2015 ; Microsoft Typography page
• OpenType math illuminated - Comparison against TeX's Appendix G
• Known MATH fonts: MDN, WOFF
• Tools: FontForge, Python, FontTools

Implementation Status

• MathValueRecord Table:

 * Value: yes since Gecko 31 bug 407059
 * DeviceTable: no

• MATH Header Table

 * Version: yes since Gecko 31 bug 407059
 * MathConstants: yes since Gecko 31 bug 407059.
 * MathGlyphInfo: yes since Gecko 31 bug 407059.
 * MathVariants: yes since Gecko 31 bug 407059

• MathConstants Table:

 * ScriptPercentScaleDown: no bug 1187682
 * ScriptScriptPercentScaleDown: no bug 1187682
 * DelimitedSubFormulaMinHeight: no
 * DisplayOperatorMinHeight: yes since Gecko 31 bug 407059
 * MathLeading: no
 * AxisHeight: yes since Gecko 33 bug 961365
 * AccentBaseHeight: no
 * FlattenedAccentBaseHeight: no bug 963079
 * SubscriptShiftDown: yes since Gecko 33 bug 961365
 * SubscriptTopMax: yes since Gecko 33 bug 961365
 * SubscriptBaselineDropMin: no bug 1231404
 * SuperscriptShiftUp: yes since Gecko 33 bug 961365
 * SuperscriptShiftUpCramped: yes since Gecko 33 bug 961365
 * SuperscriptBottomMin: yes since Gecko 33 bug 961365
 * SuperscriptBaselineDropMax: no bug 1231404
 * SubSuperscriptGapMin: yes since Gecko 33 bug 961365
 * SuperscriptBottomMaxWith: yes since Gecko 33 bug 961365
 * SpaceAfterScript: yes since Gecko 33 bug 961365
 * UpperLimitGapMin: yes since Gecko 33 bug 961365
 * UpperLimitBaselineRiseMin: yes since Gecko 33 bug 961365
 * LowerLimitGapMin: yes since Gecko 33 bug 961365
 * LowerLimitBaselineDropMin: yes since Gecko 33 bug 961365
 * StackTopShiftUp: yes since Gecko 33 bug 961365
 * StackTopDisplayStyleShiftUp: yes since Gecko 33 bug 961365
 * StackBottomShiftDown: yes since Gecko 33 bug 961365
 * StackBottomDisplayStyleShiftDown: yes since Gecko 33 bug 961365
 * StackGapMin: yes since Gecko 33 bug 961365
 * StackDisplayStyleGapMin: yes since Gecko 33 bug 961365
 * StretchStackTopShiftUp: no bug 963131
 * StretchStackTopShiftUp: no bug 963131
 * StretchStackBottomShiftDown: no bug 963131
 * StretchStackGapAboveMin: no bug 963131
 * StretchStackGapBelowMin: no bug 963131
 * FractionNumeratorShiftUp: yes since Gecko 33 bug 961365
 * FractionNumeratorDisplayStyleShiftUp: yes since Gecko 33 bug 961365
 * FractionDenominatorShiftDown: yes since Gecko 33 bug 961365
 * FractionDenominatorDisplayStyleShiftDown: yes since Gecko 33 bug 961365
 * FractionNumeratorGapMin: yes since Gecko 33 bug 961365
 * FractionNumDisplayStyleGapMin: yes since Gecko 33 bug 961365
 * FractionRuleThickness: yes since Gecko 33 bug 961365
 * FractionDenominatorGapMin: yes since Gecko 33 bug 961365
 * FractionDenoDisplayStyleGapMin: yes since Gecko 33 bug 961365
 * SkewedFractionHorizontalGap: no bug 963122
 * SkewedFractionVerticalGap: no bug 963122
 * OverbarVerticalGap: no bug 963125
 * OverbarRuleThickness: no bug 963125
 * OverbarExtraAscender: no bug 963125
 * UnderbarVerticalGap: no bug 963125
 * UnderbarRuleThickness: no bug 963125
 * UnderbarExtraDescender: no bug 963125
 * RadicalVerticalGap: yes since Gecko 33 bug 961365
 * RadicalDisplayStyleVerticalGap: yes since Gecko 33 bug 961365
 * RadicalRuleThickness: yes since Gecko 33 bug 961365
 * RadicalExtraAscender: yes since Gecko 33 bug 961365
 * RadicalKernBeforeDegree: yes since Gecko 33 bug 961365
 * RadicalKernAfterDegree: yes since Gecko 33 bug 961365
 * RadicalDegreeBottomRaise: yes since Gecko 33 bug 961365

• MathGlyphInfo Table:

 * MathItalicsCorrectionInfo: yes since Gecko 31 bug 407059
 * MathTopAccentAttachment: no bug 963136
 * ExtendedShapeCoverage: no
 * MathKernInfo: no bug 961482

• MathItalicsCorrectionInfo Table: Currently only used for placement of scripts in large operators. See bug 961482

 * Coverage: yes since Gecko 31 bug 407059
 * ItalicsCorrectionCount: yes since Gecko 31 bug 407059
 * ItalicsCorrection[]: yes since Gecko 31 bug 407059

• MathTopAccentAttachment Table:

 * TopAccentCoverage: no
 * TopAccentAttachmentCount: no
 * TopAccentAttachment[]:  no

• MathKernInfo Table:

 * MathKernCoverage: no bug 961482
 * MathKernCount: no bug 961482
 * MathKernInfoRecords[]: no bug 961482

• MathKernInfoRecord Table:

 * TopRightMathKern: no bug 961482
 * TopLeftMathKern: no bug 961482
 * BottomRightMathKern: no bug 961482
 * BottomLeftMathKern: no bug 961482

• MathKern Table:

 * HeightCount: no bug 961482
 * CorrectionHeight[]: no bug 961482
 * KernValue[]: no bug 961482

• MathVariants Table:

 * MinConnectorOverlap: no
 * VertGlyphCoverage: yes since Gecko 31  bug 407059
 * HorizGlyphCoverage: yes since Gecko 31  bug 407059
 * VertGlyphCount: yes since Gecko 31  bug 407059
 * HorizGlyphCount: yes since Gecko 31  bug 407059
 * VertGlyphConstruction[]: yes since Gecko 31 bug 407059
 * HorizGlyphConstruction[]: yes since Gecko 31 bug 407059

• MathGlyphConstruction Table

 * GlyphAssembly: yes since Gecko 31 bug 407059.
 * VariantCount: yes since Gecko 31 bug 407059
 * MathGlyphVariantRecord[]: yes since Gecko 31 bug 407059

• MathGlyphVariantRecord Table:

 * VariantGlyph: yes since Gecko 31 bug 407059
 * AdvanceMeasurement: no

• GlyphAssembly Table: Only a restricted format is supported. bug 963147

 * ItalicsCorrection: no
 * PartCount: yes since Gecko 31 bug 407059
 * PartRecords[]: yes since Gecko 31 bug 407059

• GlyphPartRecord Table

 * glyph: yes since Gecko 31 bug 407059
 * StartConnectorLength: no
 * EndConnectorLength: no
 * FullAdvance: no
 * PartFlags: yes since Gecko 31 bug 407059

• OpenType Tags

 * math: yes since Gecko 29 bug 953385
 * ssty: yes since Gecko 29 bug 442637
 * flac: no bug 963079
 * dtls: yes since Gecko 35 bug 1069929
 * rtlm: no bug 945183

Other Issues

• Implement better support for MathML stretchy fallback in gfx bug 1009582
• Default font for MathML: bug 947654 [DONE]
• Ascent/descent bug: bug 947650 [DONE], bug 598900 [DONE]
• Font Inflation: bug 1002526 [DONE]
• Add some OpenType MATH fonts in mathml.css: bug 1014601 [DONE]
• mathvariant support: done. See bug 114365, bug 930504, bug 518592. [DONE]
• refactoring of nsMathMLChar: done. See bug 663740 [DONE]
• remove ::-moz-math-stretchy: done. See bug 1000879 [DONE]
• Include new OpenType MATH fonts into the default font.mathfont-family list: done. See bug 1001169 [DONE]
• Restrict the cases where a scale transform is applied to operators. See bug 960115. [DONE]