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The id attribute provides a document-wide unique identifier for an element. [7] [8] [9] ... HTML attributes are generally classified as required attributes, ...
The first tag in such a pair is the start tag, and the second is the end tag (they are also called opening tags and closing tags). Another important component is the HTML document type declaration, which triggers standards mode rendering. The following is an example of the classic "Hello, World!" program:
The <article> element only includes the global HTML attributes such as contenteditable, id, and title. [2] However, pubdate, an optional boolean attribute of the <time> element, is often used in conjunction with <article>. If present, it indicates that the <time> element is the date the <article> was published.
The name attribute of the <a> element served the same purpose, but is now obsolete in favor of the id attribute, which can be applied to any element. [6] In all XML document types including XHTML fragments corresponding to an xml:id or similar id attributes follow the Name-syntax and begin with a letter, underscore, or colon. Notably they ...
For these reasons, and in support of a more semantic web, attributes attached to elements within HTML should describe their semantic purpose, rather than merely their intended display properties in one particular medium.
HTML attributes define desired behavior or indicate additional element properties. Most attributes require a value. In HTML, the value can be left unquoted if it does not include spaces (attribute=value), or it can be quoted with single or double quotes (attribute='value' or attribute="value"). In XML, those quotes are required.
Specification of class and id attributes for certain boilerplate messages which should be inlined; e.g., {{merge}}. Citation templates (see above). Setting anchors in the text to which incoming links may jump; this is usually done with the {} template. Almost all HTML tags that are allowed in Wikipedia permit inline CSS styles.
An attribute in a relational database can be represented as a column or field. In computing, an attribute is a specification that defines a property of an object, element, or file. It may also refer to or set the specific value for a given instance of such. For clarity, attributes should more correctly be considered metadata. An attribute is ...