2.2.13 [HTML] Section 11.3.3, Cell margins

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V0086:

The specification states:

 If a table or given column has a fixed width, cellspacing and cellpadding may 
 demand more space than assigned. User agents may give these attributes precedence 
 over the width attribute when a conflict occurs, but are not required to.

All Document Modes (All Versions)

Cellspacing and cellpadding are given precedence over the width attribute when a conflict occurs.