<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> </head> <body onload="doRequestFullscreen()"> <script> function doRequestFullscreen() { function handler(evt) { document.removeEventListener("fullscreenchange", handler); document.removeEventListener("fullscreenerror", handler); parent.is(evt.type, "fullscreenerror", "Request from " + `document inside ${parent.testTargetName} should be denied`); parent.continueTest(); } parent.ok(!document.fullscreenEnabled, "Fullscreen " + `should not be enabled in ${parent.testTargetName}`); document.addEventListener("fullscreenchange", handler); document.addEventListener("fullscreenerror", handler); document.documentElement.requestFullscreen(); } </script> </body> </html>