Both events (attached via property and via `addEventListener`) are fired in these browsers:

• Firefox: 3.7, 3.6, 3.5, 3, 2, 1.5, 1
• Safari: 5, 4.0.5, 3.2, 3.1.2, 3.0.4, 2.0.4, 2.0.3, 2.0.2, 2.0
• Chrome: 6

but fail in:

• Opera: 10.6, 10.5, 10.1, 10.01, 9.64, 9.5, 9.27, 9.2, 9.1, 9.02