| <!DOCTYPE html> | |
| <title>Client Hint Echoing Iframe</title> | |
| <body> | |
| <script> | |
| window.parent.postMessage({'headers': { | |
| 'sec-ch-viewport-width': '{{header_or_default(sec-ch-viewport-width, )}}', | |
| 'sec-ch-ua-reduced': '{{header_or_default(sec-ch-ua-reduced, )}}', | |
| 'sec-ch-ua-mobile': '{{header_or_default(sec-ch-ua-mobile, )}}', | |
| }}, '*'); | |
| </script> | |
| </body> |