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id: an identifier unique within the document, denoted in the selector language by a hash prefix e.g. #id; class: an identifier that can annotate multiple elements in a document, denoted by a dot prefix e.g. .classname (the phrase "CSS class", although sometimes used, is a misnomer, as element classes—specified with the HTML class attribute ...
HTML attributes are special words used inside the opening tag to control the element's behaviour. HTML attributes are a modifier of a HTML element type. An attribute either modifies the default functionality of an element type or provides functionality to certain element types unable to function correctly without them.
HTML 4 is an SGML application conforming to ISO 8879 – SGML. [19] April 24, 1998 HTML 4.0 [20] was reissued with minor edits without incrementing the version number. December 24, 1999 HTML 4.01 [21] was published as a W3C Recommendation. It offers the same three variations as HTML 4.0 and its last errata [22] were published on May 12, 2001 ...
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 ...
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): link: link: link: visited: link ...
W3Schools is a freemium educational website for learning coding online. [ 1 ][ 2 ] Initially released in 1998, it derives its name from the World Wide Web but is not affiliated with the W3 Consortium. [ 3 ][ 4 ][unreliable source] W3Schools offers courses covering many aspects of web development. [ 5 ] W3Schools also publishes free HTML templates.
That you added information about those classes here at Wikipedia:Catalogue of CSS classes is a good start if you want to "reserve" those class names. The master CSS document is MediaWiki:Common.css. (Well, there are style sheets loaded before that, but those can only be edited by the developers, while MediaWiki:Common.css can be edited by admins.)
The portlet class is the style used by all the div blocks around the main content. Identified blocks using that class: p-cactions – id for the list of page-related tabs above the main content (page, talk, edit, etc.), top. p-personal – id for the list of user-related links above the main content (username, talk, etc.), top.