Then maybe "display: block" is how people are doing blockish display of code blocks already. I just know I've seen several people do it. I didn't look how they did it. So it probably isn't that there are any "broken" browsers, just difference in what people are trying with CSS.

For example, thepen uses this:

tt.code
{
    background-color: #FFFFCC;
    border: thin black solid;
    padding: 10px;
    color: black;
    display: block;
}
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                - tye