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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). This similar diagnostic occurs if an article contains multiple invocations of {{ ref }} with the same ID, for example, two instances of " {{ref|1|1}} ".
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 certain element types unable to function correctly without them. In HTML syntax, an attribute is ...
However, all valid characters and sequences in the UCS, including all bidirectional controls or private-use assignments (but with the exception of non-whitespace C0 and C1 controls, non-characters, and surrogates) are also usable and valid in HTML, XML, XHTML and MathML, either in plain-text values of attributes or in text elements (by encoding ...
the effective value of the attribute can only be a valid identifier (or a space-separated list of such identifiers) and must be referencing the unique element defined in the document with an attribute declared with the type ID in the DTD (or the unique element defined in an XML document with a pseudo-attribute "xml:id") and whose effective ...
HTML markup consists of several key components, including those called tags (and their attributes), character-based data types, character references and entity references. HTML tags most commonly come in pairs like < h1 > and </ h1 >, although some represent empty elements and so are unpaired, for example < img >.
X-Request-ID: f058ebd6-02f7-4d3f-942e-904344e8cde5: X-UA-Compatible [74] Recommends the preferred rendering engine (often a backward-compatibility mode) to use to display the content. Also used to activate Chrome Frame in Internet Explorer. In HTML Standard, only the IE=edge value is defined. [75] X-UA-Compatible: IE=edge X-UA-Compatible: IE ...
TagSoup is a Java library that parses HTML, cleans it up, and delivers a stream of SAX events representing well-formed XML (not necessarily valid XHTML). This tools is used for processing JNLP files in the open source implementation of the JNLP protocol available in IcedTea-Web , a sub-project of IcedTea , the build and integration project of ...
in HTML, the value of the src attribute of the img element provides a URI reference, as does the value of the href attribute of the a or link element; in XML, the system identifier appearing after the SYSTEM keyword in a DTD is a fragmentless URI reference;