Struct SvgLength
sealed struct SvgLength
Represents a length value.
A length in SVG can be specified using absolute units (e.g., px, cm)
or relative units (e.g., em, %). If no unit is specified, the value
is interpreted in the current user coordinate system.
More details: https://www.w3.org/TR/SVG11/types.html#DataTypeLength
