No, you don't need to do that. Classes are used when you think you're going to use that style multiple times in multiple places on the page. For example, you might want to highlight abbreviations on a page. Some pages might have 1 abbreviation, some have 10, and others have none. When you write the abbreviation class, you give yourself the option to have multiple elements using that class on any given page. The only time one would change a class to an ID is if one needed the ID to act as a specificity marker or an anchor on the page as well.
Value is a 'physical' characteristic of the property. Property declares what should be formatted.
Property is a stylistic parameter (attribute) that can be influenced through CSS, e.g. FONT or WIDTH. There must always be a corresponing value or values set to each property, e.g. font: bold or font: bold san-serif.
Imported Style Sheet is a sheet that can be imported to (combined with) another sheet. This allows creating one main sheet containing declarations that apply to the whole site and partial sheets containing declarations that apply to specific elements (or documents) that may require additional styling. By importing partial sheets to the main sheet a number of sources can be combined into one.
External Style Sheet is a template/document/file containing style information which can be linked with any number of HTML documents. This is a very convenient way of formatting the entire site as well as restyling it by editing just one file.
Cascading Style Sheets (CSS) is not case sensitve. However, font families, URLs to images, and other direct references with the style sheet may be. The trick is that if you write a document using an XML declaration and an XHTML doctype, then the CSS class names will be case sensitive for some browsers. It is a good idea to avoid naming classes where the only difference is the case, for example:
div.myclass { ...}
div.myClass { ... }
If the DOCTYPE or XML declaration is ever removed from your pages, even by mistake, the last instance of the style will be used, regardless of case.
There are three kinds of CSS style sheets: external, internal, and inline. External styles control how things look across many pages on a website. Internal styles control the look of just one page. Inline styles control just one element of a single page, even just a single word.
CSS stands for Cascading Style Sheets. Basically, CSS is a language that manages the design and presentation of web pages -- the way things look. It works together with HTML, or HyperText Markup Language, which handles the content of web pages. With CSS you can create rules to tell your website how you want it to display information. And you can keep the commands for the style stuff -- fonts, colors, and so on -- separate from the commands for the content. They’re called “cascading” because you can have multiple style sheets, with one style sheet inheriting properties (or “cascading”) from others.
There are two types of CSS rules: ruleset and at-rule. Ruleset identifies selector or selectors and declares style which is to be attached to that selector or selectors. For example P {text-indent: 10pt} is a CSS rule. CSS rulesets consist of two parts: selector- P and declaration - {text-indent: 10pt}. P {text-indent: 10pt} - CSS rule (ruleset) {text-indent: 10pt} - CSS declaration text-indent - CSS property 10pt - CSS value
Embedded style is the style attached to one specific document. The style information is specified as a content of the STYLE element inside the HEAD element and will apply to the entire document.