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Some tags that resemble HTML are actually MediaWiki parser and extension tags, and so are actually wiki markup. HTML included in pages can be validated for HTML5 compliance by using validation. Note that some elements and attributes supported by MediaWiki and browsers have been deprecated by HTML5 and should no longer be used.
Interface elements known as graphical control elements, controls or widgets are software components that a computer user interacts with through direct manipulation to read or edit information about an application. Each widget facilitates a specific user-computer interaction.
The HTML5 <article> element represents a complete composition in a web page or web application that is independently distributable or reusable, e.g. in syndication. This could be a forum post, a magazine or newspaper article, a blog entry, a user-submitted comment, an interactive widget or gadget, or any other independent item of content.
In HTML and XML, a numeric character reference refers to a character by its Universal Coded Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
HTML attributes are special words used inside the opening tag to control the element's behaviour. It is a piece of markup language used to adjust the behavior or display of an HTML element.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 ...
This is the case for many, but not all, elements within an HTML document. The distinction is explicitly emphasised in HTML 4.01 Specification: Elements are not tags. Some people refer to elements as tags (e.g., "the P tag"). Remember that the element is one thing, and the tag (be it start or end tag) is another.
Although these elements are encapsulated with regard to HTML and CSS, they can still fire events that can be picked up by other elements in the document. [5] [6] The scoped subtree in an element is called a shadow tree. The element the shadow tree is attached to is called a shadow host. [6]
Microdata is an attempt to provide a simpler way of annotating HTML elements with machine-readable tags than the similar approaches of using RDFa and microformats. In 2013, because the W3C HTML Working Group failed to find someone to serve as an editor for the Microdata HTML specification, its development was terminated with a 'Note'.