Bitmapped fonts always fit between the ascent line and descent line.
Many languages use glyphs that extend beyond the ascent line or descent line.
However, these glyphs may disturb the line spacing in a line or a paragraph. The glyph that exceeds the ascent line on one line may cross the descent line of the line above it, where it may overwrite a glyph that has a descender. You can determine whether glyphs from outline fonts exceed the ascent and descent lines by using the OutlineMetrics function. OutlineMetrics returns the maximum and minimum y-values for whatever glyphs you choose. You can get the values of the ascent and descent lines using the FontMetrics procedure.