The file table.html shows the various options of using CSS in tables.

The file non-table.html shows how to use <div>s and CSS to emulate a table and how to make it not a table.

You can click on the various cells and then set properties for that cell by using the sliders or entering a CSS background color.

If you click on a cell labeled ROW then the entire row is selected (the <tr> tag)

If you click on a cell labeled COL then the entire column is selected (the <col> tag)

The three buttons at the top allow you to select the entire <table>, the <thead> and the <tbody>

The <select> at the bottom of the page allows you to apply one of a number of style sheets to the table.