Bug: SVG font-size with absolute CSS units (mm, cm, in) is not converted per SVG specification

LightBurn Software Questions
5

I ran into a similar situation involving SVG scaling in a Python program creating SVG files to print and cut reproduction punched cards.

I eventually used a command-line flag to select the scale factor corresponding to Inkscape or LightBurn:

SVGSCALE = 96.0/25.4            # converts "millimeters as SVG points" to real millimeters
parser.add_argument('--lbsvg', action='store_true',
                    help="Work around LightBurn SVG issues")
… snippage …
transform="scale(" + repr(1.0 if args.lbsvg else SVGSCALE) + ")",
            stroke=Tooling if args.layout == "laser" else CardMark,
            stroke_width=svg.mm(DefStroke if args.lbsvg else DefStroke/SVGSCALE),
            fill="none",
        )
    )

Perhaps SVG scaling has as many dialects as G-Code …