Tests for bugs 3439, 5764, 7701 - Mouse events vs. DOM manipulation.

Move the mouse pointer from left to right:

1              
1              
2
3
4
5
Log

mouseover on t1_1
mouseout on t1_1
mouseover on t1_2
mouseout on t1_2
mouseover on t2_1
mouseout on t2_1
mouseover on t2_2
mouseout on t2_2
mouseover on t3_1
mouseover on t3_2
mouseout on t3_2
mouseover on t4_1
mouseover on t4_2
mouseout on t4_2
mouseover on t5_1
mouseover on t5_2
mouseout on t5_2
mouseover on frame6
mouseover on t6
mouseout on t6
mouseout on frame6