public SvgLengthElementContext(SvgElement element, SvgLengthDirection dir)
{
_element = element ?? throw new ArgumentNullException(nameof(element));
_dir = dir;
}
internal SvgLength(string value, SvgElement element, SvgLengthDirection direction)
: this(value, new SvgLengthElementContext(element, direction))
{
}