This little example demonstrates the effect of the paint-order css property for an svg path element. This property can be used to get a nicer border, as it can tell the browser to first draw the stroke, and then do the fill. The default value of "fill" causes the browser to do the fill first and then the stroke, which can lead to suboptimal results.
The svg for the swan is by Gordon Johnson.
Value for "paint-order" property: