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Description of the issue:
How can this issue be reproduced?
Just by going to youtube.com for me
Expected result:
Brave Version( check About Brave):
Mobile Device details
Ipad air m3
Additional Information:
This is a new/known issue:
opened 12:36PM - 04 Aug 26 UTC
OS/iOS
### Description
iPhone (iOS 26.6)
After last Brave UPDATE Youtube Videos can't… be made Fullscreen anymore while in "Desktop site Mode"
It worked before last Brave UPDATE
### Steps to reproduce
1. Open Any Youtube video on iOS
2. click Request Desktop site (may be little different wording in English version)
3. Youtube reloads
4. click Fullscreen button
5. you will see "Your browser doesn't support full screen"
7. It worked before last Brave UPDATE
### Actual result
"Your browser doesn't support full screen"
<img width="2796" height="1290" alt="Image" src="https://github.com/user-attachments/assets/7b689dc2-3e1c-4b8d-8e0d-f17ea67ca130" />
### Expected result
Brave Should go Full Screen like it did before last Brave Update
### Reproduces how often
Easily reproduced
### Brave version
1.92 (144)
### Device/iOS version
iPhone 16 plus
iOS 26.6
### Affected browser versions
- [x] latest AppStore
- [ ] latest TestFlight
- [ ] previous TestFlight
### Reproducibility
- [x] with Brave Shields disabled
- [ ] in the latest version of mobile Safari
### Miscellaneous information
It is crucial problem because Brave in "Mobile Mode" don't display Youtube description, youtube chats, youtube comments, NOTHING. Displays only video.
Youtube page id renedered properly in Brave ONLY in DESKTOP MODE so it is crucial for Desktop mode fullscreen to work