Note: Ensure mouse gestures are disabled when running this test in Opera. In Opera 11.10 you can disable gestures by selecting Opera > Preferences > Advanced > Shortcuts. Then uncheck Enable mouse gestures. Also, to test "pressing-and-holding the right mouse button then clicking the left mouse" (*) ensure that Enable Mouse Flips is disabled. To disable it open opera:config then search for "Enable Mouse Flips" and uncheck it. As of 04/15/2011, for some reason (*) neither PASSes nor FAILs.

Will press and hold Left mouse button Middle mouse button Right mouse button on blue square then click Left mouse button Middle mouse button Right mouse button