![]() ![]() ![]() CSS2 defines the information in that database and allows style sheet authors to contribute to it. CSS1 referred to this database but gave no details about what was in it. In the CSS2 font model, as in CSS1, each user agent has a "fontĭatabase" at its disposition. These enhanced capabilities are referred to as 'WebFonts' Synthesis and progressive rendering, and enables fonts to beĭownloaded over the Web. user agents, in selecting a font when an author's requested fontĬSS2 improves client-side font matching, enables font.style sheet authors, to describe the fonts they want to be used.Stylistically similar fonts that the user agent had available) otherĬSS2 changes all that, and allows much greater liberty for: Alternateįonts could be specified through the properties, but beyond that, userĪgents had no way to propose other fonts to the user (even On the client system and were identified solely by name. In CSS1, all fonts were assumed to be present How the user agent handles these properties, when there is no matching font on the client has expandedīetween CSS1 and CSS2. In both CSS1 and CSS2, authors specify font characteristics If not, what should be done? Should a different font be substituted?Ĭan the font be synthesized? Can it be retrieved from the Web?.If so, what glyph(s) does this character or sequence of.Does the user agent have this font available?.Is there, directly or by inheritance, a font specified for this character?.Mapping from characters to abstract glyphs.Ī visual user agent must address the following issues before actually A font is a set of glyphs,Īll observing the same basic motif according to design, size,Īppearance, and other attributes associated with the entire set, and a Style, in the form of outlines or bitmaps that A glyph is the actualĪrtistic representation of an abstract glyph, in some typographic More characters may be depicted by one or more abstract glyphs, inĪ possibly context-dependent fashion. Information elements) must be mapped to abstract glyphs. When a document's text is to be displayed visually, characters (abstract 15.5.2 Examples of font matching 15.1 Introduction.15.5.1 Mapping font weight values to font names.15.4.3 Coordinate units on the em square.15.4.1 Introducing Font Characteristics.15.3.8 Descriptors for Alignment: 'baseline', 'centerline', 'mathline', and 'topline'.15.3.7 Descriptors for Synthesis: 'widths', 'bbox' and 'definition-src'.15.3.6 Descriptors for Matching: 'panose-1', 'stemv', 'stemh', 'slope', 'cap-height', 'x-height', 'ascent', and 'descent'.15.3.5 Descriptor for Referencing: 'src'.15.3.4 Descriptor for Numeric Values: 'units-per-em'.15.3.3 Descriptors for Font Data Qualification: 'unicode-range'.15.3.1 Font Descriptions and 15.3.2 Descriptors for Selecting a Font: 'font-family', 'font-style', 'font-variant', 'font-weight', 'font-stretch' and 'font-size'.15.2.5 Shorthand font property: the 'font' property.15.2.4 Font size: the 'font-size' and 'font-size-adjust' properties.15.2.3 Font styling: the 'font-style', 'font-variant', 'font-weight' and 'font-stretch' properties.15.2.2 Font family: the 'font-family' property. ![]()
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