---
title: 'Story rendering'
---
In Storybook, your stories render in a special “preview” iframe (Canvas tab) inside the larger Storybook web application. The JavaScript build configuration of the preview is controlled by a [webpack](./integration.md#default-configuration) config, but you also may want to directly control the HTML that is rendered to help your stories render correctly.
## Adding to <head>
If you need to add extra elements to the `head` of the preview iframe, for instance to load static stylesheets, font files, or similar, you can create a file called [`.storybook/preview-head.html`](./overview.md#configure-story-rendering) and add tags like this:
Storybook will inject these tags into the _preview iframe_ where your components are rendered not the Storybook application UI.
## Adding to <body>
Sometimes, you may need to add different tags to the ``. This is useful for adding some custom content roots.
You can accomplish this by creating a file called `preview-body.html` inside your `.storybook` directory and add tags like this:
If using relative sizing in your project (like `rem` or `em`), you may update the base `font-size` by adding a `style` tag to `preview-body.html`:
Storybook will inject these tags into the _preview iframe_ where your components are rendered not the Storybook application UI.