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A web style sheet is a form of separation of content and presentation for web design in which the markup (i.e., HTML or XHTML) of a webpage contains the page's semantic content and structure, but does not define its visual layout (style). Instead, the style is defined in an external style sheet file using a style sheet language such as CSS or ...
Initially code-named "Cougar", [18] HTML 4.0 adopted many browser-specific element types and attributes, but also sought to phase out Netscape's visual markup features by marking them as deprecated in favor of style sheets. HTML 4 is an SGML application conforming to ISO 8879 – SGML.
One modern style sheet language with widespread use is Cascading Style Sheets (CSS), which is used to style documents written in HTML, XHTML, SVG, XUL, and other markup languages. For content in structured documents to be presented, a set of stylistic rules – describing, for example, colors, fonts and layout – must be applied.
A markup language, like HTML and less XUL, may define some primitive elements to style a document, for example <emphasis> to bold. CSS post styles a document to "screen media" or "paged media". Screen media, displayed as a single page (possibly with hyperlinks), that has a fixed horizontal width but a virtually unlimited vertical height.
Improving web presentation capabilities was a topic of interest to many in the web community and nine different style sheet languages were proposed on the www-style mailing list. [28] Of these nine proposals, two were especially influential on what became CSS: Cascading HTML Style Sheets [24] and Stream-based Style Sheet Proposal (SSP).
HTML is used to represent the structure or content of a document, its presentation remains the sole responsibility of CSS style sheets. A default style sheet is suggested as part of the CSS standard, giving a default rendering for HTML. [14] Behavior (interactivity) is also kept separate from content, and is handled by scripts.
The following is a list of style sheet languages. Standard. Cascading Style Sheets (CSS) Document Style Semantics and Specification Language (DSSSL)
Cascading Style Sheets allows for flexible formatting of a page. They should be used instead of tables for non-tabular content whenever possible, because they can be manipulated by the reader or overridden by an author if your CSS is embedded in another page via a template .