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+# Components
+
+
+## Injection
+
+Plugins can inject components by registering React components to some roles.
+
+#### Register a components
+
+During the initialization phase of your plugin, dispatch the `GitBook.registerComponent` action:
+
+```js
+dispatch(GitBook.registerComponent(MyCustomButton, { role: 'toolbar:buttons:left' }));
+```
+
+#### Roles
+
+Custom roles can be use for interopability with other plugins, but GitBook and the default theme set a convention for common roles:
+
+| Role | Description | Props |
+| ---- | ----------- | ----- |
+| `page:container` | DIV container for the page's content | `{ page: Page }` |
+| `summary:container` | DIV container for the whole summary | `{ summary: Summary }` |
+| `summary:parts` | DIV container for summary's parts | `{ parts: List<SummaryPart> }` |
+| `summary:part` | DIV for a specific part | `{ part: SummaryPart }` |
+| `summary:articles` | UL container for a part's articles | `{ articles: List<SummaryArticle> }` |
+| `summary:article` | LI for a specific article | `{ article: SummaryArticle }` |
+
+## Default Components
+
+#### `GitBook.Head`
+
+Extends the meta tags of the page. This is an alias for [react-helmet](https://github.com/nfl/react-helmet).
+
+```js
+<GitBook.Head
+    title="My page"
+  />
+```
+
+#### `GitBook.ImportCSS`
+
+Import a CSS file by resolving the path correctly according to the current page:
+
+```js
+<GitBook.ImportCSS href="myfile.css" />
+```
+
+#### `GitBook.ImportJS`
+
+Import a JS file by resolving the path correctly according to the current page:
+
+```js
+<GitBook.ImportJS src="mylib.js" />
+```
+
+#### `GitBook.InjectedComponent`
+
+Inject a component matching a specific role:
+
+```js
+<GitBook.InjectedComponent matching={{ role: 'mycustomrole' }} props={{ someProp: 1 }}>
+    <b>Inner content</b>
+</GitBook.InjectedComponent>
+```
+
+#### `GitBook.InjectedComponentSet`
+
+Same API as `InjectedComponentSet` but render the matching components in chain instead of composed:
+
+```js
+<GitBook.InjectedComponentSet matching={{ role: 'mytoolbar' }} />
+```
+
+**Warning:** Children are discarded.
+
+#### `GitBook.FlexLayout` and `GitBook.FlexBox`
+
+A simple wrapper that provides a Flexbox layout with the given direction and style. Any additional props you set on the Flexbox are rendered.
+
+```js
+<GitBook.FlexLayout column>
+    <GitBook.FlexBox>First column</GitBook.FlexBox>
+    <GitBook.FlexBox>Second column</GitBook.FlexBox>
+</GitBook.FlexLayout>
+```