signifies an element on which the user is currently clicking

signifies visited hyperlinks

signifies unvisited hyperlinks

a:hover MUST come after a:link and a:visited in the CSS definition in order to be effective. Also, a:active MUST come after a:hover in the CSS definition as follows

The border-collapse specifies whether the browser should control the appearance of the adjacent borders that touch each other or whether each cell should maintain its style

The border-spacing specifies the width that should appear between table cells.

The caption-side captions are presented in the <caption> element. By default, these are rendered above the table in the document. You use the caption-side property to control the placement of the table caption

The empty-cells specifies whether the border should be shown if a cell is empty

The table-layout allows browsers to speed up layout of a table by using the first width properties it comes across for the rest of a column rather than having to load the whole table before rendering it.

specifies an image for the marker rather than a bullet point or number

allows you to control the shape or appearance of the marker

The list-style serves as shorthand for the preceding properties.