I'm trying to use a style sheet to implement the following
<table border=1 cellspacing=0 cellpadding=0>

So far, I've got:
table { padding: 0px;}

how do you define cell spacing? (I've tried spacing: 0px)

 

Authoritative resource here - http://www.htmlhelp.com/reference/css/ - there's an offline version available which is damn useful to have on the desktop (along with HTML 4.0 reference). Another useful place is http://www.w3schools.com/css/default.asp

cell spacing in a table is handled with margin (cell padding is padding as you've got)

Another option for just having zero spacing is to use border-collapse: collapse;

 

Superb - I'll give it a whirl.

I've noted those sites too.

Thanks Chiark.