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CSS2 in May 1998 (later revised in CSS 2.1 and CSS 2.2) extended CSS1 with facilities for positioning and table layout. The preference for using HTML tables rather than CSS to control the layout of whole web pages was due to several reasons: the desire of content publishers to replicate their existing corporate design elements on their web site;
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
Some HTML elements are defined as empty elements and take the form < tag attribute1 = "value1" attribute2 = "value2" >. Empty elements may enclose no content, for instance, the < br > tag or the inline < img > tag. The name of an HTML element is the name used in the tags.
An empty element may be: An empty HTML element, one with tag(s) but no content (HTML element § Empty element) An empty XML element, one with tag(s) but no content (XML § Key terminology) An empty SGML element, one with tag(s) but no content (Standard Generalized Markup Language § EMPTY).
Used to mark elements in articles that are considered not to be part of the proper content of the article. These are annotations, maintenance templates, navigation links, media controls etc. These elements are often filtered out of 'alternative' views of the content, like CD-ROM editions, bookprint, webpage print, mobile views etc.
Using CSS to hide unintentionally-created document structure is considered poor web authoring practice. This approach will transmit redundant information to the clients In some cases, this approach includes raw wikitext, which is meaningless in the context of an article (e.g. template:Infobox President )
The null sign (∅) is often used in mathematics for denoting the empty set. The same letter in linguistics represents zero , the lack of an element. It is commonly used in phonology , morphology , and syntax .
Keith Clark's Selectivizr is a popular polyfill that makes many CSS3 selectors work in IE 8 and below. It reads the page's stylesheets looking for a number of known CSS3 selectors, then uses a JavaScript selector library to query the document for elements matching those selectors, applying the styles directly to those elements.