letter-spacing CSS property
Controls spacing between characters of text (i.e. "tracking" in typographical terms). Not to be confused with kerning.
Controls the usage of the kerning information (spacing between letters) stored in the font. Note that this only affects OpenType fonts with kerning information, it has no effect on other fonts.
canvasrenderingcontext2d api: letterspacing
css property: letter-spacing: svg support
attributes: presentation: letter-spacing