2.2.6.1.2.2 Normal Style

At least one cell style (section 2.2.6.1.2) MUST be included in the STYLES collection (section 2.1.7.20.3) and this cell style (section 2.2.6.1.2) is called the Normal style. The Normal style MUST reference the first XF record (section 2.4.353) in the XFS collection (section 2.1.7.20.3), and this XF record (section 2.4.353) MUST be a cell style XF (section 2.2.6.1.2.1), where the fStyle field equals 1.

The Normal style, being the only required cell style (section 2.2.6.1.2), ensures that all cells have a cell style (section 2.2.6.1.2) to reference. The Normal style also provides a convenient object in which to store default cell formatting properties for an entire workbook, because all cells will typically reference the Normal style by default, until they are modified to reference a different cell style (section 2.2.6.1.2).