This SVG has no drawing commands and is empty about svg.skia HOT 10 CLOSED

Looking closer, I see this:

Exception thrown: 'System.InvalidCastException' in Svg.Custom.dll
testhost Warning: 0 : Attribute 'stroke' cannot be set - type 'Svg.SvgPath' cannot convert from string '#FF0000FF'.
Exception thrown: 'System.InvalidCastException' in Svg.Custom.dll
testhost Warning: 0 : Attribute 'fill' cannot be set - type 'Svg.SvgPath' cannot convert from string '#FF0000FF'.

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The inner exception that triggers this is:

Unable to cast object of type 'Svg.SvgColourServer' to type 'System.Drawing.Color'.

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Seems it is because the colors have transparency and then the SvgColourConverter only checks for color lengths of 4 or 7, so basically #RGB or #RRGGBB... I am pretty sure alpha is supposed to be working in there?

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Seems it was this commit:
wieslawsoltes/SVG@8c9b1f2#diff-2d8975b837b07567b22b03dbddeb4d6d8dc96107c7dbbcd3baf921f1c0e2ed19

Not sure why this was changed in the commit that was adding ExCSS.

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Another scary thing with the converters from System.Drawing is that it expects ARGB:

https://github.com/dotnet/runtime/blob/74d927967dcf9dc1801c310603d6dc843dc28ad6/src/libraries/Common/src/System/Drawing/ColorConverterCommon.cs#L56-L59

// We support 1, 3, or 4 arguments:
// 1 -- full ARGB encoded
// 3 -- RGB
// 4 -- ARGB

However, the SVG spec uses CSS colors which is RGBA:

https://developer.mozilla.org/en-US/docs/Web/CSS/hex-color

#RGB        // The three-value syntax
#RGBA       // The four-value syntax
#RRGGBB     // The six-value syntax
#RRGGBBAA   // The eight-value syntax

EDIT: Actually, the SVG spec says only 3 or 6 digits: https://developer.mozilla.org/en-US/docs/Web/SVG/Content_type#color but I see my edge is using the full alpha as well making it all a lie if you ask me.

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I am trying this:

else if (colour.StartsWith("#", StringComparison.InvariantCulture))
{
    // There are 4 types of #-based colors:
    //   4 chars: #RGB
    //   5 chars: #RGBA
    //   7 chars: #RRGGBB
    //   9 chars: #RRGGBBAA
    if (colour.Length == 4)
        colour = string.Format(culture, "#{0}{0}{1}{1}{2}{2}", colour[1], colour[2], colour[3]);
    else if (colour.Length == 5)
        colour = string.Format(culture, "#{0}{0}{1}{1}{2}{2}{3}{3}", colour[1], colour[2], colour[3], colour[4]);
    else if (colour.Length != 7 && colour.Length != 9)
        throw new SvgException("Colour is in an invalid format: '" + colour + "'");

    return base.ConvertFrom(context, culture, colour);
}

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You are referring to css color but it's different specification from svg. Alpha is not supported you have to use stroke-opacity.

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https://www.w3.org/TR/2008/REC-CSS2-20080411/syndata.html#color-units

The format of an RGB value in hexadecimal notation is a '#' immediately followed by either three or six hexadecimal characters. The three-digit RGB notation (#rgb) is converted into six-digit form (#rrggbb) by replicating digits, not by adding zeros. For example, #fb0 expands to #ffbb00. This ensures that white (#ffffff) can be specified with the short notation (#fff) and removes any dependencies on the color depth of the display.

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https://www.w3.org/TR/2008/REC-CSS2-20080411/colors.html#propdef-color

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OK, that is sort of where I eventually got to :)

We can close this as a design goal. BUT, Edge supports alpha. So yeah, it is all a lie anyway

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