title: $:/plugins/tiddlywiki/markdown/readme
This plugin provides Markdown support via the [[markdown-it|https://github.com/markdown-it/markdown-it]] parser and its associated plugins:
* markdown-it-deflist
* markdown-it-footnote
* markdown-it-ins
* markdown-it-mark
* markdown-it-sub
* markdown-it-sup
!! Compatibility Notes
* <p>A tab character in Markdown has a size of four spaces. Configure the tab size of your code editor accordingly. For example, if you use <$text text="CodeMirror"/>, it is recommended that you set $:/config/codemirror/indentUnit and $:/config/codemirror/tabSize to `4` to avoid inconsistent indentations.</p>
* <p>HTML blocks are ultimately parsed by the <$text text=WikiText/> parser: //an opening tag followed by a blank line will activate block-level parsing for its content//. When working with tags designed to contain literal content, such as `<pre>` and `<style>` tags, refrain from adding blank lines after the opening tags.</p>
* <p>You must terminate a table with either a blank line or another block-level structure.</p>
* <p>`latex-parser` in $:/config/markdown/renderWikiTextPragma is no longer required and will be ignored.</p>
* <p>Config option `linkNewWindow` is removed.</p>
!! Extending the Parser
You can extend the parser by loading additional markdown-it plugins this way:
```js
var plugin1 = require(...);
var plugin2 = require(...);
var md = $tw.Wiki.parsers["text/markdown"].prototype.md;
md.use(plugin1)
.use(plugin2, opts, ...);
```
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