[CSS21] tables, percentages, and border-spacing

How wide should be the navy rectangle: 200px or 400px?

Browser results:

• 400px in Firefox 15.0.1 and in Firefox 18
• 200px in IE8, IE9, IE10, Chrome 22.0.1229.79, Chrome 23.0.1251.2, Opera 12.0.2, Opera 12.5, Safari 6.0 and in Konqueror 4.9.2