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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.
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 >.
An example of hidden comments This won't be visible except in "edit" mode. --> Another way to include a comment in the wiki markup uses the {} template, which can be abbreviated as {}. This template "expands" to the empty string, generating no HTML output; it is visible only to people editing the wiki source.
Tidy parses the MediaWiki output and cleans it up to increase the likelihood that valid HTML4 is rendered. For example, with Tidy enabled, <br>, </br>, <br/>, <br.> all rendered as <br />. Tidy is not enabled for MediaWiki interface pages. Tidy was never perfect and has been known to introduce errors.
BBCode ("Bulletin Board Code") is a lightweight markup language used to format messages in many Internet forum software. It was first introduced in 1998. [citation needed] The available "tags" of BBCode are usually indicated by square brackets ([and ]) surrounding a keyword, and are parsed before being translated into HTML. [citation needed]
In HTML and XML, a numeric character reference refers to a character by its Universal 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.
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For codes from 0 to 127, the original 7-bit ASCII standard set, most of these characters can be used without a character reference. Codes from 160 to 255 can all be created using character entity names. Only a few higher-numbered codes can be created using entity names, but all can be created by decimal number character reference.