What's the compatibility with other browsers?

Firefox: support optional path (i.e., ctx.scrollPathIntoView() and ctx.scrollPathIntoView(path))
IE & Safari: does not support ctx.scrollPathIntoView

The spec needs to be clarified regarding what is the "intended path". It is clear in the non-normative note, which says: "Scrolls the current default path or the given path into view."  The normative prose should be clearer.  Also the IDL in the spec should be fixed to use the "optional" modifier, instead of using overloads.

The intended behavior is that when the path argument is not specified, the rendering context's current path is to be used.

Also, something the spec does not say is what to do if the path argument is not specified and the context's current path is empty. Should we throw an exception, abort silently, or maybe scroll the canvas into view? Not clear...