This was a document I started to see what interfaces Adobe's
SVG Viewer *doesn't* support since they took that information
out of their status document. I compared the SVG 1.0 spec with
the document Adobe published giving their current support for
SVG by ASV 3.0 build 76. I got less than half way down the IDL
before I stopped, so there is probably lots more that ASV
doesn't support.

http://www.w3.org/TR/SVG10/idl.html
http://www.adobe.com/svg/indepth/pdfs/CurrentSupport.pdf

List of interfaces and parts of interfaces not supported:

SVGException
SVGElement
  attribute DOMString xmlbase;
  readonly attribute SVGSVGElement ownerSVGElement;
SVGAnimatedBoolean
SVGAnimatedString
SVGStringList
SVGAnimatedEnumeration
SVGAnimatedInteger
SVGNumber
SVGAnimatedNumber
SVGNumberList
SVGAnimatedNumberList
SVGLength
SVGAnimatedLength
SVGLengthList
SVGAnimatedLengthList
SVGAngle
SVGAnimatedAngle
SVGColor
SVGICCColor
SVGAnimatedRect
SVGUnitTypes
SVGStylable
  readonly attribute SVGAnimatedString className;
  css::CSSValue getPresentationAttribute ( in DOMString name );
SVGLocatable
  readonly attribute SVGElement              nearestViewportElement;
  readonly attribute SVGElement              farthestViewportElement;
  SVGMatrix getScreenCTM (  );
  SVGMatrix getTransformToElement ( in SVGElement element )
                  raises( SVGException );
interface SVGTransformable
  : SVGLocatable
  readonly attribute SVGAnimatedTransformList transform;
SVGTests
SVGLangSpace
SVGExternalResourcesRequired
SVGFitToViewBox
SVGZoomAndPan
SVGViewSpec
SVGURIReference
SVGCSSRule
SVGRenderingIntent
SVGDocument
  : events::DocumentEvent
SVGSVGElement
  : SVGTests,
    SVGLangSpace,
    SVGExternalResourcesRequired,
    SVGFitToViewBox,
    SVGZoomAndPan,
    events::DocumentEvent,
    css::ViewCSS,
    css::DocumentCSS { 
  readonly attribute SVGAnimatedLength x;
  readonly attribute SVGAnimatedLength y;
  readonly attribute SVGAnimatedLength width;
  readonly attribute SVGAnimatedLength height;
           attribute DOMString         contentScriptType;
                       // raises DOMException on setting
           attribute DOMString         contentStyleType;
                       // raises DOMException on setting
  readonly attribute SVGRect           viewport;
  readonly attribute float pixelUnitToMillimeterX;
  readonly attribute float pixelUnitToMillimeterY;
  readonly attribute float screenPixelToMillimeterX;
  readonly attribute float screenPixelToMillimeterY;
           attribute boolean useCurrentView;
                       // raises DOMException on setting
  readonly attribute SVGViewSpec currentView;
  unsigned long suspendRedraw ( in unsigned long max_wait_milliseconds );
  void          unsuspendRedraw ( in unsigned long suspend_handle_id )
                  raises( DOMException );
  void          unsuspendRedrawAll (  );
  void          forceRedraw (  );
  NodeList      getIntersectionList ( in SVGRect rect, in SVGElement referenceElement );
  NodeList      getEnclosureList ( in SVGRect rect, in SVGElement referenceElement );
  boolean       checkIntersection ( in SVGElement element, in SVGRect rect );
  boolean       checkEnclosure ( in SVGElement element, in SVGRect rect );
  SVGNumber              createSVGNumber (  );
  SVGLength              createSVGLength (  );
  SVGAngle               createSVGAngle (  );
  SVGTransform           createSVGTransform (  );
  SVGTransform     createSVGTransformFromMatrix ( in SVGMatrix matrix );
SVGGElement
  : SVGTests,
    SVGLangSpace,
    SVGExternalResourcesRequired,
SVGDefsElement
  : SVGTests,
    SVGLangSpace,
    SVGExternalResourcesRequired,
SVGDescElement
  : SVGLangSpace
SVGTitleElement
  : SVGLangSpace
SVGSymbolElement
  : SVGLangSpace,
    SVGExternalResourcesRequired,
    SVGFitToViewBox
SVGUseElement
  : SVGURIReference,
    SVGTests,
    SVGLangSpace,
    SVGExternalResourcesRequired,
  readonly attribute SVGAnimatedLength   x;
  readonly attribute SVGAnimatedLength   y;
  readonly attribute SVGAnimatedLength   width;
  readonly attribute SVGAnimatedLength   height;
  readonly attribute SVGElementInstance instanceRoot;
  readonly attribute SVGElementInstance animatedInstanceRoot;
SVGElementInstance
SVGElementInstanceList
SVGImageElement
  : SVGURIReference,
    SVGTests,
    SVGLangSpace,
    SVGExternalResourcesRequired,
  readonly attribute SVGAnimatedLength x;
  readonly attribute SVGAnimatedLength y;
  readonly attribute SVGAnimatedLength width;
  readonly attribute SVGAnimatedLength height;
  readonly attribute SVGAnimatedPreserveAspectRatio preserveAspectRatio;
interface SVGSwitchElement
  : SVGTests,
    SVGLangSpace,
    SVGExternalResourcesRequired


still less than half way down the IDL