Gets or sets a value that indicates where the gradient stop is placed within the gradient.
HRESULT ISVGStopElement::get_offset(ISVGAnimatedNumber **p);HRESULT ISVGStopElement::put_offset(ISVGAnimatedNumber *v);
Returns S_OK if successful, or an error value otherwise.
The offset is a number (typically ranging from 0 through 1) that indicates where the gradient stop is placed. For linear gradients, the offset represents a location along the gradient vector. For radial gradients, the offset represents a percentage distance from the ( ISVGRadialGradientElement::fx, ISVGRadialGradientElement::fy) point to the edge of the largest (that is, outermost) circle.