[Bug]: Replay iframe scrollbar ignores OS dark mode setting (color-scheme not set)

[christian-oudard]

ReplayWeb.page Version

2.4.3

What did you expect to happen? What happened instead?

When embedding on a system with dark mode enabled, I expected the scrollbar in the replay iframe to match the OS color scheme (dark). Instead, the scrollbar renders as light gray, even though all other scrollbars on the page and in the browser are dark.

The outer page sets color-scheme: dark light but this doesn't cascade into the replay iframe.

Step-by-step reproduction instructions

1. Enable dark mode in your OS
2. Embed with embed="replayonly" serving any WACZ/WARC file
3. Observe the scrollbar on the replayed page is light, not matching the OS dark theme
4. Compare with scrollbars on other pages — they are dark

Additional details