The Size and Spacing tab contains properties that enable you to define how an embedded or linked picture is sized and spaced when published into HTML-based outputs. Sizing and spacing do not apply to precoded HTML files.
HTML file sizing
Defines the height and width of the picture file inserted into the HTML pages as either a percentage (%) of the original image size, or as an exact measurement.
HTML file spacing
Defines the spacing around the picture file inserted into the HTML pages as an exact measurement.