After restoring a closed tab, the page's CSS styles are not loaded

[deevroman]

How to reproduce the issue?

0. Open https://openstreetmap.org/history
1. Select any changeset
2. Close the tab
3. Wait a few seconds
4. Restore the tab
5. Styles are not loaded

2025-02-13.01.00.09.mp4

Firefox 136.0b4. I've also seen reports of a similar issue in Discord and the local community's Telegram chat, but I'm not sure if the steps are exactly the same.

It seems that the problem appeared today/yesterday.

[tomhughes]

It would help if you provided a working URL instead of leaving us to guess a valid changeset...

[tomhughes]

https://www.openstreetmap.org/changeset/162437268 looks like it was he changeset you used, and restoring the tab works fine for me in firefox.

It's hard so to see how what you describe can be anything other than a browser bug to be honest - if the browser can load it right the first time then it should be able to restore it and a restore is no different to an initial load as far as we are concerned.

[deevroman]

Added the URL. But I think I missed an important step in the text (there is one in the video).

1. Open https://openstreetmap.org/history
2. Select any changeset
   and then also close the tab, wait and restore the tab.

If you open the changeset by URL, the tab is restored correctly. Probably the problem is how osm.org changes the browser history when switching from different URLs, in this case from /history -> /changeset/ID

[tomhughes]

Ah yes I can reproduce that. Unfortunately absolutely nobody understands that code...

[hlfan]

It could be that we need to reintroduce the xhr query parameter and undo 8130b38 if that response is used for tab restoration.