The page refers to CSS properties that are specified using absolute units (like 'in', 'px', 'mm') rather than relative ones (like '%', 'em'). These units are used in STYLE attributes or in external CSS files linked to via the LINK element.

Use relative rather than absolute units in style sheet property values. Replace all occurrences of units like 'px', 'pt', 'pc', 'cm', 'mm' with percentages or 'em'.

Whenever possible it is best to use relative units.

In this way the visual layout of the page will be "liquid", in the sense that it can adapt to the specific browser being used, the specific screen that supports it, and the font size that a user might want to select as a default.