Sidebar Browser

HTTPS sandbox: allow-scripts allow-forms allow-same-origin allow-popups allow-popups-to-escape-sandbox
Permissions Policy: browser defaults
Sandbox toggle: per-tab and temporary
Unknown navigation: marker shown; Back, Forward, and external-open disabled
HTTPS history: one -> two -> one -> two
Loopback HTTP: loaded under the default sandbox
Invalid protocol: Only HTTP and HTTPS addresses are supported; use Document Preview for local files.