The input field in IE6 (and older probably too) has a top and bottom margin of 1px
in both quirks and standard mode. This can cause a not so nice effect.
Firefox displays this without the margin.
I did no other browser test.

At the current moment I am not aware of any workaround.
* {
    font-size: 12px;
    font-family: Tahoma, Arial}

#container {
    border: 1px solid #000000;
    padding: 0px;
    width: 200px;
    background-color: #00ff00}

#cell {
    border: 1px solid #000000;
    padding: 0px;
    background-color: #0000ff}
    

#field {
    margin: 0px;
    border: 1px solid #ff0000;
    width: 198px;
    background-color: #ffffff}

Div:

Table:


Zoomed IE6 screen shot:
See the bug?