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Learn about Cascading Style Sheets LACUNY Web Management Roundtable October 21, 2005

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Presentation on theme: "Learn about Cascading Style Sheets LACUNY Web Management Roundtable October 21, 2005"— Presentation transcript:

1 Learn about Cascading Style Sheets LACUNY Web Management Roundtable October 21, 2005

2 October 21, 2005LACUNY Web Roundtable 2 CSS Separate Style From Structure of a Web Page Specify point size and font of text; Set margins within a web page; Create a distinctive style for individual web pages or sets of web pages; Format style to one element of a web page or to a numerous pages; Control color of different elements of a web page; Etc.

3 October 21, 2005LACUNY Web Roundtable 3 Font Appearance of an Element HTML code SPECIAL COLLECTION CSS rule H3 { Font-family: times new roman, 'serif'; Color: #800000; Text-align: center; }

4 October 21, 2005LACUNY Web Roundtable 4 Understanding Style Rules Style RulesThe style characteristics for an HTML element are expressed by Style Rules. Style SheetA set of style rules is called a Style Sheet. Style rules are contained in the element in the document’s section. P {color:blue; font-size: 24pt;}

5 October 21, 2005LACUNY Web Roundtable 5 Understanding Style Rules Style RuleA Style Rule is composed of two parts: a selector and a declaration. TH {color: red;}. SelectorThe Selector indicates the element to which the rule is applied. DeclarationThe Declaration determines the property values of a selector. Selector Declaration

6 October 21, 2005LACUNY Web Roundtable 6 Understanding Style Rules PropertyThe Property specifies a characteristic, such as color, font-family, position, and is followed by a colon (:). ValueThe Value expresses specification of a property, such as red for color, arial for font family, 12 pt for font-size, and is followed by a semicolon (;). P {color: red;} Property Value

7 October 21, 2005LACUNY Web Roundtable 7 Using the Element The element is always positioned in the section of the document. The element always contains attribute. The value “text/css” defines the style language as Cascading Style Sheets. P {color:blue; font-size: 24pt;}

8 October 21, 2005LACUNY Web Roundtable 8 Using External Style Sheet Style Rules can be expressed in an external Style Sheet - a text document that doesn’t contain any HTML code. There is no element in an external style sheet. External Style Sheet has a.css extension. h1, h2, h3 {font-family: verdana, arial, 'sans serif'; color: #9933FF; text-align: center;}

9 October 21, 2005LACUNY Web Roundtable 9 Linking to an External Style Sheet To link a Web page to an external style sheet a element should be added within element of a document with the URL to a style sheet. It tells the browser to find a specified style sheet. Demo_1

10 October 21, 2005LACUNY Web Roundtable 10 Linking to an External Style Sheet Demo_1 HREF attribute states the relative URL to the style sheet The REL attribute describes the relationship between the current document and the document identified by the href attribute

11 October 21, 2005LACUNY Web Roundtable 11 Using the Class Attribute Selector CLASS is an HTML attribute that assigns a class name to any HTML element on a Web page. Can be used to identify which style sheet rules should be applied for the particular element of a Web page A.nav:link {color:#FF3300; text-decoration: none;} Class Selector Element

12 October 21, 2005LACUNY Web Roundtable 12 Using the Class Attribute Selector A class name is created by declaring a style rule and adding (.) flag character indicating that the selector is a class selector. Add it to HTML code of a Web page by using the CLASS attribute. A.nav:link {color:#FF3300; text-decoration: none;} ERIC

13 October 21, 2005LACUNY Web Roundtable 13 Example 1 Example 1 CSS Style Sheet ary/CSS/style_1.htm

14 October 21, 2005LACUNY Web Roundtable 14 Example 2 Example 2 CSS Style Sheet ary/CSS/style_2.htm

15 October 21, 2005LACUNY Web Roundtable 15 Example 3 Example 3 CSS Style Sheet ary/CSS/style_3.htm

16 October 21, 2005LACUNY Web Roundtable 16 Lehman College Library Web Site Lehman College Library Web Site

17 October 21, 2005LACUNY Web Roundtable 17 Lehman College Library Web Site CSS A.nav:link { color: #990000; font-size: 12px; line-height: 14px; font-family: arial, verdana, geneva, helvetica; text-decoration: none; } A.nav:visited { color: #CC3333; font-size: 12px; line-height: 14px; font- family: arial, verdana, geneva, helvetica; text-decoration: none; } HTML In the element In the element Check your Lehman account

18 October 21, 2005LACUNY Web Roundtable 18 Useful Resources Schengili-Roberts, Keith. Core CSS Cascading Style Sheets. 2 nd ed. Upper Saddle River, NJ: Prentice Hall PTR, Sklar, Joel. Designing Web Pages with Cascading Style Sheets. Course Technology, Incorporated, W3C WDG Web Design Group


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