CONSOLE ERROR: Blocked script execution in 'http://web-platform.test:8001/html/browsers/sandboxing/inner-iframe.html' because the document's frame is sandboxed and the 'allow-scripts' permission is not set.
CONSOLE ERROR: line 20: Uncaught SecurityError: Sandbox access violation: Blocked a frame at "http://web-platform.test:8001" from accessing a frame at "http://web-platform.test:8001".  The frame being accessed is sandboxed and lacks the "allow-same-origin" flag.
