[CSS21] Why are browser default style values different from Appendix D

Hello,

I was just wondering why there is so much difference between browser default values and CSS 2.1 Default values.

I know Appendix D is non-normative, but since real world implementation is significantly different, would developers/browsers be interested in seeing these changes driven back in to the spec?


HTML            Property                CSS2.1          FF                      Opera                   Safari

Dir             margin-left             40px                    0                       40px                    0
H2              margin          .75em   0               .83em   0               .83em   0               .83em 0
H3              margin          .83em   0               1em 0                   1em 0                   1em 0
H4              margin          1.12em 0                1.325em 0               1.325em 0               1.325em 0
H5              margin          1.5em   0               1.67em 0                1.67em 0                1.67em 0
H6              font-size               .75em                   .67em                   .67em                   .67em
H6              margin          1.67em 0                2.33em 0                2.33em 0                2.33em 0
Menu            margin          1.12em 0                1em 0                   1em 0                   1em 0
OL              margin          1.12em 0                1em 0                   1em 0                   1em 0
OL              margin-left             40px                    0                       0                       0
P               margin          1.12em 0                1em 0                   1em 0                   1em 0
UL              margin          1.12em 0                1em 0                   1em 0                   1em 0
UL              margin-left             40px                    0                       0                       0


Thanks,
Saloni