960-12-col.css + 960-12-col-rtl.css test

The letter "C" with a purple background.

Grid container – on body:hover.

Purple shaded grid column.

Prefix/Suffix – padded space converted to a border then colored for visibility.

Grid column with a dotted outline.

Grid within grids – outline count matches embed depth on hover.

Purple dot.

Alpha/Omega – left or right dot indicates cut margins.

• See 12 & 16 column test.
• Viewing 12 column test. – See left to right.
• See 16 column test.
• See 24 column test.
• See other tests.