www.reddit.com - rely on a shim for navigation api which is not working

[karlcow]

URL: https://www.reddit.com/r/worldnews/comments/1chctrn/rworldnews_live_thread_russian_invasion_of/

Browser / Version: Firefox 127.0
Operating System: Mac OS X 10.15
Tested Another Browser: Yes Chrome

Problem type: Something else
Description: URL change without user request
Steps to Reproduce:

1. Go to https://www.reddit.com/r/worldnews/comments/1chctrn/rworldnews_live_thread_russian_invasion_of/
2. Click on the Open button just below the title
3. A new tab is opening with the URL https://www.reddit.com/live/18hnzysb1elcs
4. Go back to the initial tab, and check the URL

Expected:
URL should be https://www.reddit.com/r/worldnews/comments/1chctrn/rworldnews_live_thread_russian_invasion_of/

Actual:
URL has changed to the same URL than the new tab.
aka https://www.reddit.com/live/18hnzysb1elcs

This is happening in both Safari and Firefox.
This is not happening in Chrome.

View the screenshot

Browser Configuration

• gfx.webrender.software: false
• blockList: basic
• channel: nightly
• defaultUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:127.0) Gecko/20100101 Firefox/127.0
• hasTouchScreen: false
• frameworks: {'fastclick': False, 'mobify': False, 'marfeel': False}
• mixed active content blocked: false
• mixed passive content blocked: false
• tracking content blocked: false

View console log messages

From webcompat.com with ❤️

[karlcow]

I have the feeling this is because reddit.com is using window.navigation non standard API.
They rely on a polyfill but which itself has its own limitations.
virtualstate/navigation#27

[karlcow]

WebKit/standards-positions#34
mozilla/standards-positions#543

[karlcow]

tracked by rdar://117546597 at Apple

[au5ton]

window.navigation is a standard API that is part of the HTML spec, other engines just haven't implemented it yet

[karlcow]

Added to the HTML spec on June 26, 2023
whatwg/html@c3ca6c2
https://html.spec.whatwg.org/multipage/nav-history-apis.html#navigation-api