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Pseudo-classes are used in CSS selectors to permit formatting based on information that is not contained in the document tree.. One example of a widely used pseudo-class is : hover, which identifies content only when the user "points to" the visible element, usually by holding the mouse cursor over it.
Classes are defined in the HTML document (generated by the server or by JavaScript). They are used as selectors in CSS. Learn to use the browser inspectors of Firefox, lE, Chrome or Safari to inspect the webpages. By default much of the CSS and JavaScript resources are processed for efficiency.
Selectors specify which elements are to be influenced by the style rule. As such, selectors are the glue between the structure of the document and the stylistic rules in the style sheets. In the example above, the "h1" selector selects all h1 elements. More complex selectors can select elements based on, e.g., their context, attributes and content.
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 ...
The :hover pseudo-class in CSS allows developers to define the styles that should be applied to an element. The styles are applied when the user hovers their mouse pointer over the element. Unlike static CSS properties, the :hover pseudo-class targets an element only when a specific condition (hovering) is met. The styles are not applied at all ...
For checkboxes and radio buttons, you can use the :checked pseudo selector. This can be very useful when combined with sibling css selectors (~) or :has() You can look for the class names calculator-value-true and calculator-value-false. This is especially useful with the passthru type of field. See {{Calculator-hideifzero}} for an example.
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 ...
Elements in an HTML or XML document are represented as nodes in the DOM tree. Each element node has a tag name and attributes, and can contain other element nodes or text nodes as children. For example, an HTML document with the following structure: