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W3C Markup Validation Service. Tag certifying that a website has been checked for well-formed XHTML (above) and CSS (below) markup. The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition.
Help:Markup validation. The W3C Markup Validation Service lets editors check web pages for conformance to HTML and XHTML standards. It is helpful for catching minor problems such as duplicate section names or citation IDs. Although most major browsers will tolerate many of the errors, and will display a document successfully even if it contains ...
Implementations of these interface elements are available through JavaScript libraries such as jQuery. HTML 4 introduced the <label> tag, which is intended to represent a caption in a user interface, and can be associated with a specific form control by specifying the id attribute of the control in the label tag's for attribute.
HTML element content categories. HTML documents imply a structure of nested HTML elements. These are indicated in the document by HTML tags, enclosed in angle brackets thus: < p >. [better source needed] In the simple, general case, the extent of an element is indicated by a pair of tags: a "start tag" < p > and "end tag" </ p >. The text ...
CSS HTML Validator primarily works offline (except for link checking when it must go online), which has speed and privacy benefits compared to web-based solutions and services like the W3C Markup Validation Service. However, the user must keep the software updated unlike web-based solutions which are typically kept updated by the solution provider.
A style applied to an HTML element via HTML "style" attribute 3: Media Type: A property definition applies to all media types unless a media-specific CSS is defined 4: User defined: Most browsers have the accessibility feature: a user-defined CSS 5: Selector specificity: A specific contextual selector (# heading p) overwrites generic definition ...
A document type definition ( DTD) is a specification file that contains set of markup declarations that define a document type for an SGML -family markup language ( GML, SGML, XML, HTML ). The DTD specification file can be used to validate documents. A DTD defines the valid building blocks of an XML document.
Overview. XHTML 1.0 was "a reformulation of the three HTML 4 document types as applications of XML 1.0". [6] The World Wide Web Consortium (W3C) also simultaneously maintained the HTML 4.01 Recommendation. In the XHTML 1.0 Recommendation document, as published and revised in August 2002, the W3C commented that "The XHTML family is the next step ...