When a user agent renders text, it must select a font to use. However, almost no font in existence contains every possible character which might be needed in a document. Thus, the truth is that text is rendered a character at a time, with the user agent doing its best to locate the needed character from its list of available fonts. It must not only determine that a character exists, but also css navigation learn css whether or not it is available in the style, weight, and variant which may be requested by the document’s CSS rules. In these rules, a font family is actually a collection of font faces given a common name. For example, Times New Roman is really a collection of font faces.

Each face depicts a variant of the basic font; thus, the collection may contain Times New Roman Italic, Times New Roman Bold, and so on. Therefore, a font face is a variant on the default font in the font family. Thus, the default font will have a name something like Times New Roman Regular. Authors do not actually select these faces by name, but instead express preferences for the kind of face they would like to use through various font-related properties.

The webmaster (or the user) can influence this selection process by providing a list of fonts to be used, in order of preference, in the rendering of an element. The user agent utilizes this list as a part of the rules for picking which font family to use for the rendering of a given character.

The steps involved in font matching are as follows:

1 In the rendering of a character of text, the user agent builds a list of font properties which are applicable to the character. The user agent then identifies a font family which would appear to contain those characteristics, as well as the needed character.
2 If the needed font face cannot be found within the family, the user agent can attempt advanced handling (described later).
3 If steps 1 and 2 fail, then the user agent should proceed to the next font family in its font list. The process of font face matching is described in the next section.
4 If the needed font face can be found within the font family, but the needed character does not exist, then the user agent should proceed to the next font family in its font list.
5 If the needed character cannot be found in the needed font face, then the user agent should indicate that the proper character cannot be displayed.

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