Hi, list. When MathJax and KaTeX output formulas in SVG, they attach data, e.g. Unicode info, math classes, etc. For instance, KaTeX outputs something like that for $1 + 1$:

<span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mrow><mn>1</mn><mo>+</mo><mn>1</mn></mrow><annotation encoding="application/x-tex">1 + 1</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height: 0.7278em; vertical-align: -0.0833em;"></span><span class="mord">1</span><span class="mspace" style="margin-right: 0.2222em;"></span><span class="mbin">+</span><span class="mspace" style="margin-right: 0.2222em;"></span></span><span class="base"><span class="strut" style="height: 0.6444em;"></span><span class="mord">1</span></span></span></span>

AFAIK LaTeX and ConTeXt don't export to SVG natively and tools like dvisvgm don't know about this information when converting .dvi or .pdf files to SVG. But info is somehow available via tracing macros. In ConTeXt, I get the following log from this file:

\startTEXpage

%\tracingmacros etc.

\tracingcommands\plusone
\tracingonline\plusone
$1 + 1$
\tracingcommands\zerocount
\stopTEXpage

Log:

(a lot of info...)
7:7: {\Umathfractiondelsize}
7:7: {\Umathfractiondelsize}
7:7: {\Umathfractiondelsize}
7:7: {\Umathfractiondelsize}
7:6: {\Umathskeweddelimitertolerance}

7:4: {the character U+0031 1}
7:3: {blank space character U+0020 'space'}
7:3: {the character U+002B 'plus sign'}
7:3: {blank space character U+0020 'space'}
7:3: {the character U+0031 1}
...

Also, MathJax and KaTeX can export glyph outlines, which I know ConTeXt already handles with via Metapost and Lua. So, I wonder if such structure (paths + data) can be saved/exported as a Lua table, a SVG file or any other format which keeps the semantic information of math formulas. Thank you very much

Jairo