The modern Big Picture mode allows for easy age verification. Doesn't seem to even be a date selection, but a simple "Are you over 18"
I’d say you can safely close this 10 years old issue that can probably only be reproduced on that specific combination of os / graphics driver / cef anyway. that legacy version of steam os doesn’t even work anymore as far as I understand, so even if you want to reproduce to investigate the root cause you probably can’t.
I don't have the access rights to close issues. You can on the other hand close issues that you've made yourself.
Closing per the last couple comments.
Nothing extracted yet.
Not sure if related to steamos or more generically the web view in steam for linux, anyway
Affected configuration:
intel i7 4970k, 32gb ram ddr3 1600 corsair, zotac gtx 970, asus z97-A.
connected to a full hd tv via hdmi (so fullhd resolution), latest steamos version
See first screenshot for the settings>system screen
https://www.dropbox.com/s/889aql6t7v6n07e/Screenshot1.png?dl=0
When in big picture mode
use the web browser tab to open the steam store
try any game that requires age check (Eg: Rust)
try selecting any of the 3 dropdown either with the mouse or a controller
(a ps3 one connected via usb in my case)
Expected
the dropdown will render some options to allow selecting
Actual:
the screen turn almost black apart for some weird line at the top left of the screen see :
https://www.dropbox.com/s/926tpsxpj9n2if7/Screenshot2.png?dl=0
moving the mouse just a little will show:
https://www.dropbox.com/s/23r7sh061tl9ls6/Screenshot3.png?dl=0
moving a bit more will go back to normal:
https://www.dropbox.com/s/w9bap9f4jmo1nyg/Screenshot4.png?dl=0