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This section gives examples of diagnostics generated by the markup validation service, and suggests possible fixes. Diagnostics are by line and column of the generated HTML for the page. It may be helpful to obtain the HTML in order to understand the diagnostic. For example, if you using the Firefox browser, you can type control-U to see the HTML.
The markup language called wikitext, also known as wiki markup or wikicode, consists of the syntax and keywords used by the MediaWiki software to format a page. (Note the lowercase spelling of these terms.
For assistance with using Cascading Style Sheets on Wikipedia, see Help:Cascading Style Sheets. Some tags that resemble HTML are actually MediaWiki parser and extension tags, and so are actually wiki markup. HTML included in pages can be validated for HTML5 compliance by using validation.
For a guide to editing, see Wikipedia:Contributing to Wikipedia For an overview of commonly used style guidelines, see Wikipedia:Simplified Manual of Style For a page on how to use Wikipedia in bite-sized morsels, see Wikipedia:Tips
However, if your code works with the content part of the page (the #mw-content-text element), you should use the 'wikipage.content' hook instead. This way your code will successfully reprocess the page when it is updated asynchronously and the hook is fired again. There are plenty of tools that do so, ranging from edit preview to watchlist ...
You can add a table using HTML rather than wiki markup, as described at HTML element#Tables. However, HTML tables are discouraged because wikitables are easier to customize and maintain, as described at manual of style on tables. Also, note that the <thead>, <tbody>, <tfoot>, <colgroup>, and <col> elements are not supported in wikitext.
See the HTML standard for <br> or <small>. Mediawiki's Tidy tool will be replaced which may cause many now valid tags, such as </br> and <center /> , to no longer work. 03 (dump)