Summary of MathML Polyfill needs

This is a list of all of the elements/attributes in MathML 4 marked as "not in MathML-Core" or "not-core". If the checkbox is checked, then a polyfill exists for the element/attribute. If the item is crossed out, then the Math WG has agreed that writing a polyfill for the element/attribute is not needed/encouraged.

• Attrs on all elements
  • href (all MathML elements)
• math
  • maxwidth attr
  • overflow attr ("linebreak", "scroll", "elide", "truncate", "scale")
  • altimg, altimg-width, altimg-height, altimg-valign
• token elements
  • mathsize = "small", "medium", "big"
  • mathvariants (#77)
• mglyph
  • "src", "width", "height", "valign", "alt"
• mo
  • accent attr
  • Linebreaking attrs (linebreak, lineleading, linebreakstyle, linebreakmultchar)
  • Indentation attrs (indentalign, indentshift, indenttarget, indentalignfirst, indentshiftfirst, indentalignlast, indentshiftlast)
• ms
  • lquote, rquote
• mpadded
  • % attribute values for width, height, depth
• mfenced
  • open, close, separators)
• mfrac
  • numalign, denomalign
  • bevelled
  • linethickness = "thin", "medium", "thick"
• mstyle
  • scriptsizemultiplier, scriptminsize, infixlinebreakstyle, decimalpoint (#1)
• menclose
  • (notation values)
• msub
  • subscriptshift (#27)
• msup
  • superscriptshift (#27)
• msubsup
  • subscriptshift, superscriptshift (#27)
• munder
  • align
• mover
  • align
• munderover
  • align, alignunder
• mtable
  • align ("top" | "bottom" | "center" | "baseline" | "axis"), rownumber?)
  • rowalign ("top" | "bottom" | "center" | "baseline" | "axis") +
  • columnalign ("left" | "center" | "right") +
  • columnwidth ("auto" | length | "fit") +
  • width ("auto" | length)
  • rowspacing (length)+
  • columnspacing (length)+
  • rowlines ("none" | "solid" | "dashed") +
  • columnlines ("none" | "solid" | "dashed") +
  • frame ("none" | "solid" | "dashed")
  • framespacing (length, length)
  • equalrows (bool)
  • equalcolumns (bool)
  • displaystyle (bool)
• mtr
  • rowalign ("top" | "bottom" | "center" | "baseline" | "axis")
  • columnalign ("left" | "center" | "right") +
• mlabeledtr
  • same attrs as mtr
• mtd
  • rowalign ("top" | "bottom" | "center" | "baseline" | "axis")
  • columnalign ("left" | "center" | "right")
• maligngroup (#181)
• malignmark (#181)
• Elementary Math
  • mstack, msgroup, msrow, msline, mscarries, mscarry, mlongdiv (lots of attrs)
• maction
  • actiontype
  • selection
• semantics
  • make presentation MathML be first child (#100)

Start with the unchecked entries in this issue, especially math maxwidth and overflow, mstyle attributes, and maction actiontype and selection. Review the MathML 4 not-core checklist and existing checked polyfills; done means each remaining item has an implemented polyfill or is explicitly marked as not needed.