The font includes ligatures and kerning pairs. Contextual kerning refers to positional adjustment that depends on more than two consecutive glyphs. The CSS3 draft suggests that kerning should always be enabled for OpenType fonts. Latin kerning and spacing were redesigned to have consistent spacing. In other fonts the kerning may be very different. Other reworked designs include terminals, stroke endings, the spacing, and the kerning. Letter-spacing should not be confused with kerning. Spacing and kerning was done by Igino Marini of iKern. Most systems with typographic features today provide this type of kerning. The samples are taken from the kerning tables of the Minion Pro font. Only with the standard CSS3, font-kerning property arrives with a complete control of kerning. The human perception of kerning can vary with the intraword and interword spacing during reading. Most modern office and desktop publishing systems support OpenType features, and hence class-based kerning. Although the stroke looks similar to an apostrophe, there is a significant difference in kerning.