HTML (Hypertext Markup Language) is a language used on most websites to format layout and content. Wiki pages are generally managed by wikitext rather than HTML, however, so only a limited number of HTML tags can be used on wiki pages.
HTML tags that can be used on Wikis
The following HTML tags can be used at Wikia:
<!-- ... -->
Keep it friendly. The use of wikitext is recommended wherever possible, as HTML makes the text in the edit box harder to read and more intimidating for new users. Complex uses of HTML and CSS can be hidden away in templates where they are less likely to get in the way of the casual editor.
Combine with CSS. CSS classes (class="classname") can be stored in site stylesheets. Both classes and CSS inline styles (style="color:pink;") can be used with the HTML tags listed above, but note that classes and styles can also be used with many types of wikitext, especially tables, table rows and cells.
Source mode is designed to handle complex html codes on an article, allowing to reduce the amount of unwanted code that is sometimes automatically added. Source mode is the best way to edit if you are using templates, or html tags such as <span>, <p>, and <div>. Click "Expand" to learn how to you can switch to this mode and make your code look cleaner.
Here are some useful tips:
When copy or pasting content, always use source mode!
When you see in the edit area of visual mode, it refers to a template, or content with code that is not supported or too complex for the visual editor to handle. In source mode you will see this content in full.
When you see in the edit area of visual mode, it refers to a comment. In source mode, you will see this content as <!-- -->.
MediaWiki has a special language called wikitext to make editing more easy. This language is supported in visual mode and will not break as easily as html.
Some html tags like <u> or <s> are supported in visual mode.
You can also enter source mode when creating or replying to threads in a forum, or when using a message wall by clicking underneath the edit area.