Issues encountered with version 2021.03.31 18:04.

1. Comments in SVG

% SOF
\startbuffer[svg]
<svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg">
<g><circle cx="50" cy="50" r="20"/></g></svg>
\stopbuffer

\starttext
\placefigure{}{\includesvgbuffer[svg][conversion=mp]}
\stoptext
% EOF

Expected: Black circle, no border, comment lines ignored.

Actual: Empty square.

2. Transparent stroke

% SOF
\startbuffer[svg]
<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
<polygon fill="#eeffff" stroke="transparent" points="500,10 500,0 0,0 0,10" />
</svg>
\stopbuffer

\starttext
\placefigure{}{\includesvgbuffer[svg][conversion=mp]}
\stoptext

% EOF

Expected: Light cyan rectangle, no border (it's transparent).

Actual: Light cyan rectangle with visible border.

3. Inkscape font specification

We discussed this previously: Inkscape extends the SVG specification with a custom style class ("-inkscape-font-specification") that allows its users to refine font styles.

% SOF
\startbuffer[svg]
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 154.6 19.3" width="155" height="19"><text x="-6.7" y="-2.3"><tspan x="-1.9" y="15" style="-inkscape-font-specification:'Roboto, Ultra-Light';font-family:Roboto;font-size:20px;font-weight:200">Roboto Ultra-Light</tspan></text></svg>
\stopbuffer

\starttext
\placefigure{}{\includesvgbuffer[svg][conversion=mp]}
\stoptext
% EOF

Expected: "Roboto Ultra-Light" appears in Roboto Ultra-Light font.

Actual: Empty square.

Supporting this via MetaPost would help maintain backwards compatibility (with ConTeXt invoking Inkscape).

Thank you!