# loader.html

Part of [Loader](https://kernstra.com/docs/web-sdk/config/loader) in the Kernstra Web SDK 1.0.0 configuration reference.

- Type: `string`
- Default: `SDK spinner; '' an empty block`
- Page: https://kernstra.com/docs/web-sdk/config/loader/html

Custom loader markup (a branded logo), put into the page as HTML: your own markup only, never a user's. It is injected verbatim (it is your own trusted configuration), so a branded loader is one line.

Web page: https://kernstra.com/docs/web-sdk/config/loader/html