Why are cellspacing and cellpadding not CSS styles
I don't know why this bothers me so much, but when I create websites, I always try to do all my styling with CSS. However one thing I always have to remember to do when I'm working with tables is add cellspacing="0" and cellpadding="0"
Why is there not a CSS property to override these antiquated HTML 4 attributes?
Cellspacing :
table { border-collapse: collapse; }
As for cellpadding, you can do
table tr td, table tr th { padding: 0; }
mat already answered, but just for completeness:
padding → cellpadding  border-spacing → cellspacing  border-collapse → no HTML equivalent   It's also worth remembering that you can set separate horizontal and vertical values for the CSS ones eg border-spacing: 0 1px .  
Eric Myer's reset stylesheet contains the following 'reset' style for table :
/* tables still need 'cellspacing="0"' in the markup */
table {
    border-collapse: collapse;
    border-spacing: 0;
}
In addition TD, TR are reset :
thead, tr, th, td {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    font-size: 100%;
    vertical-align: baseline;
    background: transparent;
}
The reason I mention this is that he has a comment 'tables still need cellpadding=0'. I assume he put this in here for a reason - probably needed by some old browsers. Judging by the fact that this is one of the very few comments he included I'm guessing its important and that there's a good reason for it.
Based on this comment - and this comment alone! - i'm continuing to use cellspacing="0" in the markup unless someone tells me definitively (below) why I dont need to. It could however likely be unnecessary in any modern browser worth supporting these days.
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