This parameter controls the general size of the text in the document. Several other values (body font size and margins) have default values that vary depending on the setting of %visual-acuity%. There are three legal values: normal, the normal, standard document size (10pt body text); tiny, a small text size (8pt body text); presbyopic, a slightly more generous size (12pt body text); and large-type, quite large (24pt body text).