javascript go back and get previous page FINAL STATE

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I am building a page that retrieves some Github repositories and then displays a punchcard chart with the data returned by the API (sorry for the screenshots in advance, but I was having trouble with the in-built code styling). I start with a semi-empty html page and I build stuff as I get the info from the API calls.

  1. Firstly, the user logs in to get all their repos, but I don't store information about it, I just pass their credentials in the header (app.js)

fetchRepositories

  1. Then, with the response I paint a list of all the repos (app.js).

list repos

  1. When clicked in one repo, a new html is load, and has js that calls the Github API to retrieve the punchcard and paint the charts (repo.js).

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What I need to accomplish is that, if while being in that second html I click on the goBack button, I go back to the previous page, but having the repo list already painted there. Is there any way I can do it without having to log in (do it all over) again?

The app is deployed here, and all the code can be found here.

Thanks for the help.

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