Understanding Style Sheet Terminology in Visual C#

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Understanding Style Sheet Terminology
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The CSS language consists of lines of code code from which all the WYSIWYG editors and dialog boxes in the world can t shield you completely. Wherever possible, this book avoids showing code and displays the relevant FrontPage dialog boxes instead. But here, when con sidering fundamentals, code it is. Have faith, though; it ll be simple. First, some definitions:
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CSS style
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This is a collection of property names and values such as font name, font size, font weight, color, background color, border type, border width, and so forth. Here s how a CSS style looks in code:
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font-family: Arial, sans-serif; color: red;
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A colon separates each property name from its value(s). Commas separate multiple values assigned to the same property. Semicolons indicate the end of a property setting and permit the beginning of the next.
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Selector
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This is the name of a CSS rule. It specifies (that is, selects) the page elements to which the rule will apply.
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Part 6: Formatting Your Web Pages
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Microsoft Office FrontPage 2003 Inside Out
CSS rule
This is a statement that assigns properties to one or more selectors.
This book focuses on three types of selectors:
Type selector
This selector has the same name as an HTML tag (that is, the name of an HTML element type). Assigning properties to a type selector modifies all text controlled by the corresponding HTML tag. The h1 selector, for example, controls the appearance of Heading 1 text. The b selector controls the appearance of boldface text, and so forth. Type selectors are among the best features of CSS. With one statement, you can change the appearance of your whole Web page or of all elements that use a given HTML style. And with one command, you can make one set of type selectors control an entire Web site. Later sections in this chapter explain how to define and use type selectors. This selector has any name you choose to give it, except that the name must begin with a period and can t be the name of an HTML tag. Unlike type selectors, class selectors don t apply automatically to all similar elements of a Web page. Instead, to apply the rule, you add a class="class-name" attribute to the HTML tag that encloses the content you want to format. (A class selector is one you invoke with a class= attribute. This isn t rocket science.) Whenever you want text in multiple places to have a consistent format, class selectors are an excellent solution. Suppose, for example, that you want error message paragraphs to look different from normal text paragraphs. Type selectors can t do this because both kinds of paragraphs use the same tag: <p>. If, however, you defined an errmsg class selector, you could apply it to whatever paragraphs were appropriate. Defining the errmsg class selector centrally guarantees that all error message paragraphs will look the same. Later sections in this chapter explain how to define and use class selectors.
Class selector
Part 6: Formatting Your Web Pages
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ID selector
This selector works somewhat like a class selector, except that the ID is the name of something in your Web page. Instead of naming a style and then invoking it from page elements, you name the page elements and then define styles for them. ID selectors can have any name you want except the name of an HTML tag. In addition, they must begin with a pound sign (#). You should never give two elements in the same page the same ID. This makes class selectors preferable for most uses. Later sections in this chapter explain how to define and use ID selectors.
Coding Style Sheet Rules
Both CSS styles and the rules that define them are rather abstract entities, not particularly amenable to WYSIWYG display. To wring every drop of function out of CSS, therefore, you ll sometimes need to click the Code tab at the bottom of the Design view window and enter the rules by hand. As seems to be the way of art, messy techniques can produce beautiful results.
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