cascading style sheets (css)

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cascading style sheets (css) cascading style sheets (css) csi 3140 www structures, techniques and standards guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides motivation html markup can be used to represent semantics: h1 means that an element is a top-level heading presentation: h1 elements look a certain way it’s advisable to separate semantics from presentation because: it’s easier to present documents on multiple platforms (browser, cell phone, spoken, …) it’s easier to generate documents with consistent look semantic and presentation changes can be made independently of one another (division of labor) user control of presentation is facilitated guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides style sheet languages cascading style sheets (css) applies to (x)html as well as xml documents in general focus of this chapter extensible stylesheet language (xsl) …

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ey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css introduction title attribute provides style sheet name guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css introduction alternative, user selectable style sheets can be specified guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css introduction guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css introduction a styled html document produced by the style sheet style2.css: guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css introduction note that alternate, user …

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dan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css syntax: selector strings elements belonging to a style class: referencing a style class in html: elements of a certain type and class: class selector: begins with a period . guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css syntax: selector strings elements belonging to a style class: referencing a style class in html: elements of a certain type and class: this span belongs to three style classes guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css syntax: selector strings elements belonging to a style class: referencing a style class in html: elements of a …

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ypes that are descendants: rule applies to li element that is part of the content of an ol element that is part of the content of a ul element guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css syntax style rules covered thus far follow ruleset syntax at-rule is a second type of rule reads style rules from specified url must appear at beginning of style sheet url relative to style sheet url guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides style sheets and html style sheets referenced by link html element are called external style sheets style sheets can be embedded directly in html document using style element most html elements have style attribute (value is list …

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dia type. declarations apply if the associated selector matches the element in question. guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css rule cascade 2- the primary sort of the declarations is by weight and origin: for normal declarations, author style sheets override user style sheets which override the default style sheet. for "!important" declarations, user style sheets override author style sheets which override the default style sheet. "!important" declaration override normal declarations. an imported style sheet has the same origin as the style sheet that imported it. five origin/weight levels: user/important author/important author/normal user/normal user agent/normal guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides css rule cascade 3- the secondary sort is by specificity of selector: more …

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cascading style sheets (css) cascading style sheets (css) csi 3140 www structures, techniques and standards guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides motivation html markup can be used to represent semantics: h1 means that an element is a top-level heading presentation: h1 elements look a certain way it’s advisable to separate semantics from presentation because: it’s easier to present documents on multiple platforms (browser, cell phone, spoken, …) it’s easier to generate documents with consistent look semantic and presentation changes can be made independently of one another (division of labor) user control of presentation is facilitated guy-vincent jourdan :: csi 3140 :: based on jeffrey c. jackson’s slides guy-vincent jourdan :: csi 3140 :: based …

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