A class may apply to any number of instances of any elements. elements depending on how they are placed relative to others in the document tree.Ĭlasses and IDs are case-sensitive, start with letters, and can include alphanumeric characters, hyphens, and underscores.class: an identifier that can annotate multiple elements in a document, identified with a period prefix e.g.classname.id: an identifier unique within the document, identified with a hash prefix e.g.elements specified by attribute, in particular:.In CSS, selectors declare which part of the markup a style applies to by matching tags and attributes in the markup itself. Each rule or rule-set consists of one or more selectors, and a declaration block. In addition to HTML, other markup languages support the use of CSS including XHTML, plain XML, SVG, and XUL.ĬSS has a simple syntax and uses a number of English keywords to specify the names of various style properties.Ī style sheet consists of a list of rules. The W3C operates a free CSS validation service for CSS documents. Internet media type ( MIME type) text/css is registered for use with CSS by RFC 2318 (March 1998). The CSS specifications are maintained by the World Wide Web Consortium (W3C). This cascading priority scheme is predictable. The name cascading comes from the specified priority scheme to determine which style rule applies if more than one rule matches a particular element. CSS also has rules for alternate formatting if the content is accessed on a mobile device. Separation of formatting and content also makes it feasible to present the same markup page in different styles for different rendering methods, such as on-screen, in print, by voice (via speech-based browser or screen reader), and on Braille-based tactile devices. css file to be cached to improve the page load speed between the pages that share the file and its formatting.
css file, which reduces complexity and repetition in the structural content and enable the. This separation can improve content accessibility provide more flexibility and control in the specification of presentation characteristics enable multiple web pages to share formatting by specifying the relevant CSS in a separate. ĬSS is designed to enable the separation of presentation and content, including layout, colors, and fonts. CSS is a cornerstone technology of the World Wide Web, alongside HTML and JavaScript. Cascading Style Sheets ( CSS) is a style sheet language used for describing the presentation of a document written in a markup language such as HTML.
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