/**
* Return a rounded pixel equivalent for a labeled CSS/SVG length.
* http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
*
* @param $length String: CSS/SVG length.
/**
* Return a rounded pixel equivalent for a labeled CSS/SVG length.
* http://www.w3.org/TR/SVG11/coords.html#UnitIdentifiers
*
* @param $length String: CSS/SVG length.