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Help:HTML in wikitext

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Wikitext
HTML
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The MediaWiki software, which drives Wikipedia, allows the use of a subset of HTML5 elements, or tags and their attributes, for presentation formatting.[1] But most HTML can be included by using equivalent wiki markup or templates; these are generally preferred within articles, as they are sometimes simpler for most editors and less intrusive in the editing window; but Wikipedia's Manual of Style recommends their use in certain cases. And HTML is useful outside of articles, for example for formatting within templates. For help with Cascading Style Sheet use within Wikipedia see Help:Cascading Style Sheets.

Some tags look like HTML, but are actually MediaWiki parser and extension tags, and so are really wiki markup. HTML in pages can be checked for HTML5 compliance by using validation. Some elements and attributes are supported by MediaWiki and browsers, but have been deprecated by HTML5, and therefore should no longer be used.

Tutorials

This help page gives only an overview of allowed markup. For further assistance and detailed specifications:

Attributes

HTML attributes provide additional information about an element and are always specified in the start tag. They are formatted as a name/value pair like name="value".

Global attributes apply to all tags. Attributes not listed here are not allowed by MediaWiki[1]:

  • class: one or more classifications to which the element belongs. See Wikipedia:Catalogue of CSS classes.
  • dir: text direction— "ltr" (left-to-right), "rtl" (right-to-left) or "auto".
  • id: unique identifier for the element.
  • lang: primary language for the contents of the element per BCP 47. The MediaWiki software automatically adds the xml:lang attribute whenever lang is defined, but xml:lang will no longer be passed when included as a separate attribute.
  • style: applies CSS styling to the contents of the element.
  • title: advisory information associated with the element.

HTML5 microdata attributes apply to all tags:[2]

  • Any attribute beginning with data-
  • itemid
  • itemprop
  • itemref
  • itemscope
  • itemtype

Other tags such as <table> support specific attributes – these are listed in the appropriate section.

Markup Renders as 
This is <span style="color:red;">red</span> text.

This is red text.

The MediaWiki Sanitizer.php does some cleanup on attributes. A best practice is to use the proper syntax.

  • Discards attributes not on a whitelist for the given element.
  • Turns broken or invalid entities into plaintext.
  • Double-quotes all attribute values.
  • Attributes without values are given the name as value.
  • Double attributes are discarded.
  • Unsafe style attributes are discarded.
  • Prepends space if there are attributes.
<tbody> </tbody>
 

 

 

 

 

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Information about booking <img alt="cheeky" height="20" src="https://de.hpage.com/interface/assets/3rdparty/ckeditor/plugins/smiley/images/tounge_smile.gif" title="cheeky" width="20" />

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<a href="https://www.booking.com/hotel/hr/apartmani-mustapic-makarska.en-gb.html?label=gen173nr-1DCAsoZUIbYXBhcnRtYW5pLW11c3RhcGljLW1ha2Fyc2thSC5YBGg7iAEBmAEuwgEKd2luZG93cyAxMMgBDNgBA-gBAZICAXmoAgM;sid=0d628984f8b4bb50e63bbc81c677d35a;dist=0&sb_price_type=total&type=total&" style="color: #000000;" target="_blank"><img align="" alt="Apartmani in Makarska Zagrebacka 80" height="150" src="http://file1.hpage.com/010130/69/bilder/005.jpg" style="padding: 0px; margin: 0px;" title="Click for booking" width="200" /></a>

 

 

 

Obsolete/deprecated elements

These elements are now obsolete and deprecated in HTML5, but still supported by browsers.[3] These tags either have an alternate tag or a template that replaces their function with CSS. See Wikipedia:HTML5 for more details on obsolete HTML parts and their replacements.

center

For centering tables, see Help:Table § Centering tables.

<center>...</center> (obsolete) is used to center text elements.

Templates: {{center}} uses CSS.

font

<font>...</font> (obsolete) is used to set the font size, font face and color of text.

Templates: {{font}} uses CSS.

rb

<rb>...</rb> (obsolete) Used to mark base text in a ruby annotation

strike

<strike>...</strike> (obsolete) formats strike-through characters; use <s> instead.

tt

<tt>...</tt> (obsolete) formats text in a fixed-width font. Use <code>, <kbd> or <samp> instead.

Templates: {{mono}} uses CSS.

Unsupported elements

These elements are not supported, but have equivalent wiki markup. Attempting to use any element not whitelisted by Sanitizer.php will result in the markup showing as plain text.

a

Further information: Help:Wiki markup § Links and URLs

<a> is used to create links. Use the [[ ]] wikimarkup for internal links and [ ] for external links.

input

Further information: mw:Extension:InputBox

<input> is used to create forms. The <inputbox> extension tag is used to create a text box with a button.

HTML Tidy

HTML Tidy is an outdated HTML4 library that is slated for removal. 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.

Exceptions

In some pages in the MediaWiki namespace, typically the short messages like button labels, HTML is not parsed, and tags will be exposed.

User and sitewide CSS and JavaScript pages are interpreted as if inside a <pre> block. See Help:User style.

Validation

Main page: Help:Markup validation

The MediaWiki software attempts to fix HTML errors, but it does not catch all of them. Where HTML is used, it is helpful to verify it with the W3C Markup Validation Service.

Parser and extension tags

Shortcuts

For a machine-generated list, see Special:Version#mw-version-parser-extensiontags. It may include tags not documented here.

Parser tags
<gallery>, <includeonly>, <noinclude>, <nowiki>, <onlyinclude>, <pre>
Extension tags
<categorytree>, <charinsert>, <chem> (alias <ce>), <graph>, <hiero>, <imagemap>, <indicator>, <inputbox>, <mapframe>, <maplink>, <math>, <math chem>, <poem>, <ref>, <references>, <score>, <section>, <syntaxhighlight> (alias <source>), <templatedata>, <templatestyles>, <timeline>

See also

References

  1. ^ a b Allowable elements and attributes are defined in the Sanitizer.php module.
  2. ^ "The microdata model". HTML Living Standard.
  3. ^ "HTML5: A vocabulary and associated APIs for HTML and XHTML: Obsolete Features". W3C. 31 July 2014.
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