To specify the position mode that will be used in the browser for your HTML page, make your selections in the Position window of the Style Composer.
The Position window of the Style Composer is comprised of the following elements:
From which you can specify: Position in normal flow, Offset from normal flow, Absolutely position.
When Absolutely Position is selected, you can specify position indicators in the measurements.
You may specify: Top, Left, Z-Index.
Note: Z-Index is optional. It sets or retrieves the stacking order for absolute or relatively positioned objects.