> For the complete documentation index, see [llms.txt](https://attr.sygnal.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://attr.sygnal.com/sa5-url/query-param-passthrough/future.md).

# Future

## Handling passthrough on a login situation

* synchronous, run in head
* on login page
  * detect login page
  * capture querystring to sessionStorage
* on receiving page, behind login
  * restore querystring
    * synchronously 

<https://codepen.io/memetican/pen/vYQjzLm/e7b9dc532f9c872b346c70dab06a4755>