MathML is a low-level specification for mathematical and scientific content on the Web and beyond.
Here is an example of Presentation MathML: and another:
|XML Entity Definitions||REC||WD|
|Units in MathML||NOTE|
|Arabic mathematical notation||NOTE|
|Structured Types in MathML 2.0||NOTE|
|Bound Variables in MathML||NOTE|
|A MathML for CSS Profile||REC|
What is MathML teaches you how to create your first equation and to understand the base constructs of MathML.
Of course, nearly all software has bugs. And some programs are further ahead implementing MathML 3 than others.
You can also join the ‘Getting math on Web pages’ Community Group. Its work is to look for gaps in the OWP (i.e., CSS, HTML, SVG, etc.) and propose fixes to improve the display of math in Web pages.
The Math Working Group is one of the oldest W3C Working Groups. During its first period of activity (1996–2004), it created and maintained versions 1 and 2 of MathML. During its second period (2006–2016), it created, among other things, MathML version 3 and saw it become an ISO standard.
The Working Group is currently closed. It will re-open when a new revision of MathML (MathML version 4) is needed or another standard related to mathematics on the Web.