[mml3.js] collection of failed MML test suite tests

Just a quick pass. Some of these seem like bugs but most seem to be missing features.

Live demo: http://codepen.io/pkra/pen/WbRzOm

Open (by priority)

Sorted by priority / feasability.

• #1252 (closed) complete failure on MS Edge.

Elementary math

• longdivision-rtl2-full -- main "line" extends far too the left. (why is that test marked RTL in the MathML suite?)
• ElementaryMathExamples-msline01-full, ElementaryMathExamples-msline02-full -- msline position is off by 1 -- simple bug?
• ElementaryMathExamples-mstack04-full -- stackalign="decimalpoint" cuts off msline -- bug?
• ElementaryMathExamples-mstack20-full -- align="baseline -2" fails (other align tests look basically ok -- simple bug?)
• ElementaryMathExamples-mscarries07-full, ElementaryMathExamples-mscarry10-full, ElementaryMathExamples-mscarry11-full -- spacing issues in subsequent carries (also, msline segmented) -- fixable?
• ElementaryMathExamples-msline03-full. -- leftoverhang / rightoverhang fails
• ElementaryMathExamples-mstack05-full. (etc.)
  • charspacing fails
• ElementaryMathExamples-mstack10-full -- charalign fails
• ElementaryMathExamples-mstack24-full -- align="axis" fails.

RTL

• Elementary math seems to ignore directions but the rendering is generally RTL? (see ltr "copies" of RTL examples on codepen)
• longdivision-rtl1-full -- Long division example is missing a linebreak (third line is on the second line) and suffers from extended "main line" mentioned above.
• Maghreb-1-full Sigma is not flipped. Probably other characters as well? (IIRC, the xslt used to us an SVG transform; CSS transforms could play a similar role in the HTML-CSS output but this probably needs to happen in a proper implementation in the output jax).

Fixed

Elementary Math

• http://www.w3.org/Math/testsuite/build/main/Topics/ElementaryMathExamples/ElementaryMathExamples-mstack02-full.xhtml
  • stackalign="center" fails (left, right are ok) -- bug?
• http://www.w3.org/Math/testsuite/build/main/Topics/ElementaryMathExamples/ElementaryMathExamples-mscarries13-full.xhtml
  • scriptsizemultiplier fails

RTL

• HTML-CSS output & browsers interference MathJax passes dir to the output and some browsers to rearrange the output (cf. complex layout and ligatures). -- Override by CSS: .MathJax span { direction: ltr ! important; display: inline-block !important; } (needs detailed testing but quick test across browsers seems fine). Example: http://codepen.io/pkra/pen/rOBWPP
  • http://www.w3.org/Math/testsuite/build/main/Topics/BiDi/RTL/mfenced2-full.xhtml
  • http://www.w3.org/Math/testsuite/build/main/Topics/BiDi/RTL/mixednumbers-rtl1-full.xhtml
  • http://www.w3.org/Math/testsuite/build/main/Topics/BiDi/RTL/mmultiscripts3-full.xhtml
  • http://www.w3.org/Math/testsuite/build/main/Topics/BiDi/RTL/mmultiscripts2-full.xhtml
  • http://www.w3.org/Math/testsuite/build/main/Topics/BiDi/RTL/thearithmeticmean1-full.xhtml
• subtraction-rtl1-full