Preserve the same underlying stored value, but reset the stored unit identifier to the given unitType.
Reset the value as a number with an associated unitType, thereby replacing the values for all of the attributes on the object.
The type of the value as specified by one of the SVG_LENGTHTYPE_* constants defined on this interface.
The value as a floating point value, in user units.
The value as a string value, in the units expressed by unitType.
The value as a floating point value, in the units expressed by unitType.