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There is no way to name a CSS rule, which would allow (for example) client-side scripts to refer to the rule even if its selector changes. Cannot include styles from a rule into another rule. CSS styles often must be duplicated in several rules to achieve the desired effect, causing additional maintenance and requiring more thorough testing.
CSS selectors[edit] The CSS selectors, expressed in terms of elements, classes and id's, relevant for the style of the page body include the following. As far as possible, examples are given, which show the result for the current style settings: :link — links — example: Help:Index ; default: help:index (See a vs :link)
Reset style sheet. A reset stylesheet (or CSS reset) is a collection of CSS rules used to clear the browser's default formatting of HTML elements, removing potential inconsistencies between different browsers. It also prevents developers from unknowingly relying on the browser default styling and force them to be explicit about the styling they ...
Style sheet language. A style sheet language, or style language, is a computer language that expresses the presentation of structured documents. One attractive feature of structured documents is that the content can be reused in many contexts and presented in various ways. Different style sheets can be attached to the logical structure to ...
Media queries. Media queries is a feature of CSS 3 allowing content rendering to adapt to different conditions such as screen resolution (e.g. mobile and desktop screen size). It became a W3C recommended standard in June 2012, [1] and is a cornerstone technology of responsive web design (RWD).
An example of this is prefixing rules with an underscore (as in _width) to target Internet Explorer 6—other browsers will ignore the line, allowing it to be used to write code specific to one browser. Similar CSS hacks involve inducing syntax errors like asterisks, missing whitespace, and CSS comments around property names.
In web development, the CSS box model refers to how HTML elements are modeled in browser engines and how the dimensions of those HTML elements are derived from CSS properties. It is a fundamental concept for the composition of HTML webpages. [3] The guidelines of the box model are described by web standards World Wide Web Consortium (W3C ...
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 XSLT.