By specifying <font-variant-east-asian> values for ‘font-variant’, you can control the glyphs used for East Asian scripts, provided that the current font both includes the glyphs (such as Japanese kanji variants) and supports the OpenType substitute feature. Within <font-variant-east-asian>, glyph forms can be controlled with <east-asian-variant-values>, and a font rendering can be controlled with <east-asian-width-values>. Supported values for <east-asian-variant-values> are ‘jis78’, ‘jis83’, ‘jis90’ and ‘jis04’ (the JIS-defined fonts) as well as ‘simplified’ (simplified Chinese), ‘traditional’ (traditional Chinese), ‘hojo-kanji’ (supplementary kanji) and ‘nlckanji’ (NCD: National Language Council-defined font). Supported values for <east-asian-width-values> are ‘full-width’, ‘half-width’, ‘third-width’, ‘quarter-width’ and ‘proportional-width’. ‘full-width’ displays a fixed-width font while ‘proportional-width’ displays a proportionally-spaced font. However, please note that each value has an effect only when the font supports that feature, such as glyph variants.