It controls the number of columns into which the text is split. This attribute control the amount of space between columns. The default is 10 pixels. This attribute controls the width of individual columns. If not specified, column width is adjusted to fit within the width of the browser window.
All columns are the same width.
This tag inserts a block of white space in the document, thereby permiting you to have greater control over the vertical and horizontal space that appears between words and lines on a page. One of the uses of this tag, for example, is for paragraph indents. Notice the effect in this paragraph. The tag can be used anywhere in a line of text. For instance, a horizontal space of 30 pixels has been inserted between these two sentences.