--- a/layout/svg/nsSVGIntegrationUtils.cpp
+++ b/layout/svg/nsSVGIntegrationUtils.cpp
@@ -692,27 +692,36 @@ nsSVGIntegrationUtils::PaintFramesWithEf
     nsLayoutUtils::PointToGfxPoint(offsetToUserSpace,
                                    frame->PresContext()->AppUnitsPerDevPixel());
   context.SetMatrix(context.CurrentMatrix().Translate(devPixelOffsetToUserSpace));
 
   gfxMatrix cssPxToDevPxMatrix = GetCSSPxToDevPxMatrix(frame);
 
   const nsStyleSVGReset *svgReset = firstFrame->StyleSVGReset();
   nsTArray<nsSVGMaskFrame *> maskFrames = effectProperties.GetMaskFrames();
+
+#ifdef MOZ_ENABLE_MASK_AS_SHORTHAND
   // For a HTML doc:
   //   According to css-masking spec, always create a mask surface when we
   //   have any item in maskFrame even if all of those items are
   //   non-resolvable <mask-sources> or <images>, we still need to create a
   //   transparent black mask layer under this condition.
   // For a SVG doc:
   //   SVG 1.1 say that  if we fail to resolve a mask, we should draw the
   //   object unmasked.
   bool shouldGenerateMaskLayer = hasSVGLayout
                                  ? maskFrames.Length() == 1 && maskFrames[0]
                                  : maskFrames.Length() > 0;
+#else
+  // Since we do not support image mask so far, we should treat any
+  // unresolvable mask as no mask. Otherwise, any object with a valid image
+  // mask, e.g. url("xxx.png"), will become invisible just because we can not
+  // handle image mask correctly. (See bug 1294171)
+  bool shouldGenerateMaskLayer = maskFrames.Length() == 1 && maskFrames[0];
+#endif
 
   // These are used if we require a temporary surface for a custom blend mode.
   RefPtr<gfxContext> target = &aParams.ctx;
   IntPoint targetOffset;
 
   bool complexEffects = false;
   DrawResult result = DrawResult::SUCCESS;
   /* Check if we need to do additional operations on this child's