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A fallback font is a reserve typeface containing symbols for as many Unicode characters as possible. When a display system encounters a character which is not part of the repertoire of any of the other available fonts, a symbol from a fallback font is used instead. Typically, a fallback font will contain symbols representative of the various types of Unicode characters. Systems that do not offer a fallback font typically display black or white rectangles, question marks, or nothing at all in place of missing characters. Placing one or more fallback fonts at the end of a list of preferred fonts ensures that there are no missing characters. ==The Unicode BMP Fallback font== 0 0 2 0 The Unicode BMP Fallback font is a Unicode font that was originally created for debugging purposes. It contains a glyph for every character in the Unicode Basic multilingual plane. Each glyph consists of a box containing the four hexadecimal digits corresponding to the Unicode value. 〔SIL International (March 20, 2008), (Unicode BMP fallback font ). Retrieved August 28, 2011.〕 The example to the left is a mock-up of the glyph for a space character ( U+0020).Unlike the Unicode Last Resort Font, the Unicode BMP Fallback font displays a different glyph for each different Unicode character, but cannot display all Unicode characters. Because four hexadecimal digits can only represent 64K characters (0000=0, FFFF=65,535) the Unicode BMP Fallback is limited to the 64K characters in the Unicode Basic Multilingual Plane. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fallback font」の詳細全文を読む スポンサード リンク
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