The following HTML input to tidy (build from 1889880 on the next branch) validates with zero errors and zero warnings on https://validator.w3.org/nu/#file, but generates the following warnings in tidy. The "proprietary" attributes seem to be well-defined in section A.3.7 of the SVG 1.1 DTD, so this looks like a simple implementation gap that can be filled by adding the attributes to attrs.h, attrs.c, and attrsdict.c If so, I can contribute a pull request.
Tidy Output
$ ./build/cmake/tidy -i -w 120 svg.html
line 8 column 9 - Warning: <svg> proprietary attribute "stroke-width"
line 8 column 9 - Warning: <svg> proprietary attribute "stroke-linecap"
line 8 column 9 - Warning: <svg> proprietary attribute "stroke-linejoin"
line 8 column 9 - Warning: <svg> proprietary attribute "stroke-miterlimit"
line 8 column 9 - Warning: <svg> proprietary attribute "stroke-opacity"
line 8 column 9 - Warning: <svg> proprietary attribute "stroke-dasharray"
line 8 column 9 - Warning: <svg> proprietary attribute "fill"
line 8 column 9 - Warning: <svg> proprietary attribute "stroke"
Info: Document content looks like HTML5
Tidy found 8 warnings and 0 errors!
...
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>SVG sample</title>
</head>
<body>
<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" stroke-width="2" stroke-linecap="butt" stroke-linejoin="round" stroke-miterlimit="4" stroke-opacity="1" stroke-dasharray="none" fill="currentColor" stroke="currentColor">
<path d="m 0.75,12.0 11.25,-9.0 4.5,3.375 0.0,-1.5 2.25,0.0 0.0,3.375 4.5,3.75 -2.25,0.0 0.0,9.0 -5.625,0.0 0.0,-7.5 -6.75,0.0 0.0,7.5 -5.625,0.0 0.0,-9.0 z" />
</svg>
</body>
</html>
The following HTML input to tidy (build from 1889880 on the next branch) validates with zero errors and zero warnings on https://validator.w3.org/nu/#file, but generates the following warnings in tidy. The "proprietary" attributes seem to be well-defined in section A.3.7 of the SVG 1.1 DTD, so this looks like a simple implementation gap that can be filled by adding the attributes to
attrs.h,attrs.c, andattrsdict.cIf so, I can contribute a pull request.Tidy Output
HTML