As per model-construct-done processing, all controls bound to a node that doesn't exist, should behave as if they are bound to an irrelevant node. All of our controls in this situation don't show up. EXCEPT the output control.

It appears that simply doing a cut-n-paste of the following code from nsXFormsControlStub.cpp to nsXFormsOutputElement.cpp fixes the problem ... } else if (mModel) { // we should have been successful. Must be pointing to a node that // doesn't exist in the instance document. Disable the control // per 4.2.2 in the spec nsCOMPtr<nsIXTFElementWrapper> xtfWrap(do_QueryInterface(mElement)); NS_ENSURE_STATE(xtfWrap); xtfWrap->SetIntrinsicState(NS_EVENT_STATE_DISABLED); // Dispatch event nsXFormsUtils::DispatchEvent(mElement, eEvent_Disabled); } ... but I need to check if doing so doesn't break something else and/or violate the spec in some way.

I'm pretty sure that this will be fixed as part of bug 313118. I'm currently working on that.

This is fixed by bug 313118. *** This bug has been marked as a duplicate of 313118 ***