text with anchor in masked hole
mouse over text in hole notice anchor is inactive.
status bar, cursor and click activity all change on mousing over text in hole
Created attachment 15787 [details]
anchored text beneath masked hole
http://www.w3.org/2003/01/REC-SVG11-20030114-errata#Capturing pointer-events with a zero opacity mask
"If an element has a mask, pointer-events are still captured even in areas where the mask goes to zero opacity."