🌐 Safe iFrame Connectivity Test

1. https://example.com

Expected: Simple HTML placeholder.

2. https://httpbin.org/html

Expected: Sample HTML returned by httpbin.

3. http://neverssl.com

Expected: HTTP-only page to test redirect/captive portal.

4. https://icanhazdadjoke.com/embedded

Expected: A random (and hilarious) joke appears.

5. http://open-notify.org/Open-Notify-API/

Expected: Text page showing space API links.

6. http://httpforever.com

Expected: Simple HTTP test page for captive networks.