tBodies count bug in Opera

Opera 7, 8 and 9 count nested table bodies inside thead and tfoot elements of table using tBodies DOM Level 1 method.

Test

Container table bodies have orange background, nested tables bodies have yellow background.

Every test should return "2".

Table 1

thead

tbody inside thead

tfoot

tbody inside tfoot

tbody 1

tbody inside tbody 1

tbody 2

tbody inside tbody 2

Table 2

thead

tfoot

tbody 1

tbody inside tbody 1

tbody 2

tbody inside tbody 2

Table 3

thead

tbody inside thead

tfoot

tbody inside tfoot

tbody 1

tbody 2

Test results

All versions Firefox, Internet Explorer (including Mac version), Safari return 2 table bodies in all tests.
Opera 7.54, 8.54, 9.01 return "4" on first test, "2" on second and "4" on third.
iCab 3.0.2 returns "6" on first test, "4" on second and "4" on third.

Real life

This Opera bug caused huge error in rendering of my timesheet system.

Moreover timesheet system become unusable.

Right Firefox rendering screenshot (IE and Safari have the same):

2006-08-24