| <!DOCTYPE html> |
| <title>Return fullscreen feature policy state from self and a sandboxed child frame</title> |
| <script> |
| "use strict"; |
| window.onload = () => { |
| let frame = document.createElement('iframe'); |
| frame.src = "/feature-policy/resources/nested-sandbox.html"; |
| frame.sandbox = "allow-scripts"; |
| |
| var handle_message = evt => { |
| if (evt.source === frame.contentWindow) { |
| window.parent.postMessage({ |
| "child": document.featurePolicy.allowedFeatures().includes("fullscreen"), |
| "grandchild": evt.data |
| },"*"); |
| document.body.removeChild(frame); |
| window.removeEventListener('message', handle_message); |
| } |
| }; |
| window.addEventListener('message', handle_message); |
| document.body.appendChild(frame); |
| }; |
| </script> |