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  2. Help:Markup validation - Wikipedia

    en.wikipedia.org/wiki/Help:Markup_validation

    An "id" is a unique identifier. Each time this attribute is used in a document it must have a different value. If you are using this attribute as a hook for style sheets it may be more appropriate to use classes (which group elements) than id (which are used to identify exactly one element).

  3. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    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 (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  4. Acid3 - Wikipedia

    en.wikipedia.org/wiki/Acid3

    The Acid3 test is a web test page from the Web Standards Project that checks a web browser's compliance with elements of various web standards, particularly the Document Object Model (DOM) and JavaScript. If the test is successful, the results of the Acid3 test will display a gradually increasing fraction counter below a series of colored ...

  5. HTML5 - Wikipedia

    en.wikipedia.org/wiki/HTML5

    Web Apps Working Group — Web Messaging, ... elements, for example <nav> (website navigation block), <footer> ... Please check for citation inaccuracies.

  6. CSS - Wikipedia

    en.wikipedia.org/wiki/CSS

    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 ...

  7. HTML element - Wikipedia

    en.wikipedia.org/wiki/HTML_element

    An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). [vague] The first used version of HTML was written by Tim Berners-Lee in 1993 and there have since been many versions of HTML.

  8. Dynamic HTML - Wikipedia

    en.wikipedia.org/wiki/Dynamic_HTML

    Although there was a basic dynamic system with Netscape Navigator 4.0, not all HTML elements were represented in the DOM. When DHTML-style techniques became widespread, varying degrees of support among web browsers for the technologies involved made them difficult to develop and debug.

  9. List of graphical user interface elements - Wikipedia

    en.wikipedia.org/wiki/List_of_graphical_user...

    A browser window allows the user to view and navigate through a collection of items, such as files or web pages. Web browsers are an example of these types of windows. Text terminal windows present a character-based, command-driven text user interfaces within the overall graphical interface. MS-DOS and Unix consoles are examples of these types ...