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---
layout: default
title: CommonMark Core Extension
description: The CommonMarkCoreExtension class includes all core Markdown syntax
---
# CommonMark Core Extension
The `CommonMarkCoreExtension` class contains all of the core Markdown syntax - things like parsing headers, code blocks, links, image, etc.
## Installation
This extension is bundled with `league/commonmark`. This library can be installed via Composer:
```bash
composer require league/commonmark
```
See the [installation](/1.3/installation/) section for more details.
## Included by Default
This extension is automatically included for you (behind-the-scenes) whenever you instantiate the parser using the `CommonMarkConverter` class:
```php
use League\CommonMark\CommonMarkConverter;
$converter = new CommonMarkConverter();
echo $converter->convertToHtml('# Hello World!');
```
Or if you call the `Environment::createCommonMarkEnvironment()` helper:
```php
use League\CommonMark\DocParser;
use League\CommonMark\Environment;
use League\CommonMark\HtmlRenderer;
$environment = Environment::createCommonMarkEnvironment();
$parser = new DocParser($environment);
$htmlRenderer = new HtmlRenderer($environment);
$markdown = '# Hello World!';
$document = $parser->parse($markdown);
echo $htmlRenderer->renderBlock($document);
```
## Manual Usage
If you ever create a `new Environment()` from scratch, you'll probably want to include the `CommonMarkCoreExtension()` so you get all the standard Markdown syntax included:
```php
use League\CommonMark\DocParser;
use League\CommonMark\Environment;
use League\CommonMark\Extension\CommonMarkCoreExtension;
use League\CommonMark\HtmlRenderer;
$environment = new Environment();
$environment->addExtension(new CommonMarkCoreExtension());
$parser = new DocParser($environment);
$htmlRenderer = new HtmlRenderer($environment);
$markdown = '# Hello World!';
$document = $parser->parse($markdown);
echo $htmlRenderer->renderBlock($document);
```
Alternatively, if you don't want all of the core Markdown syntax, avoid using `CommonMarkCoreExtension`. You can always add just the individual parsers, renderers, etc. you actually want with the [`Environment`](/1.3/customization/environment/). (This is actually how the [Inlines Only Extension](/1.3/extensions/inlines-only/) works - it only includes a subset of things that `CommonMarkCoreExtension` does!)
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