<!DOCTYPE html> <html> <body> <script> // This test checks if browser attaches the viewport-width client hint in the // HTTP request headers. // resources/echo-client-hints-received.py sets the response headers depending on the set // of client hints it receives in the request headers. fetch("../resources/echo-client-hints-received.py").then(r => { if(r.status == 200 && !r.headers.has("viewport-width-received") && !r.headers.has("viewport-width-received")) { window.top.opener.postMessage('PASS', '*'); } else { window.top.opener.postMessage('FAIL', '*'); } }); </script> </body> </html>