Rather than relying on spec authors to add a
readonly attribute unsigned long length;
to an interface that has an index getter, it would be simpler to have all such objects/interfaces expose a length property.
We've been sitting on this one for a long time. Would be good to make a decision on this.
Not going to do this for now. That specs need to include a "length" IDL attribute isn't particularly problematic.
*** Bug 20561 has been marked as a duplicate of this bug. ***