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 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 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 <body>. 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.
