When tables display on the Web, column and row SPACING disappears. The following method works best on tables with no borders.
Column and Row Spaces:
Insert a row or column where you would like a space. Add any text to any one cell (only one character is necessary.) Format the text colour to match the CELL colour. Adjust the thickness of the row spacing with point sizes. Adust the width of the column by adding more characters to your text or by formatting a fixed width. (The spaces can be varied with different colours.)
Add a row with NO text or fields. Format the CELL colour. The row will display on the Web as a thin line of the chosen colour.