test_read_only.html (1277B)
1 <!DOCTYPE html> 2 <html> 3 <head> 4 <meta charset="utf-8" /> 5 <title>Page Visibility API is Read Only</title> 6 7 <script src="/resources/testharness.js"></script> 8 <script src="/resources/testharnessreport.js"></script> 9 <script type="text/javascript" src="resources/pagevistestharness.js"></script> 10 11 <script type="text/javascript"> 12 setup({ explicit_done: true }); 13 function onload_test() 14 { 15 //check for feature definition first before attempting to overwrite 16 pv_test(); 17 18 //Check document.hidden 19 document.hidden = "new value"; 20 test_true(document.hidden !== "new value", 'document.hidden is read only.'); 21 22 //Check document.visibilityState 23 document.visibilityState = "new value"; 24 test_true(document.visibilityState !== "new value", 25 "document.visibilityState is read only."); 26 27 done(); 28 } 29 </script> 30 </head> 31 <body onload="onload_test();"> 32 <h1>Description</h1> 33 <p>This test validates that the Page Visibility attributes are read only.</p> 34 35 <div id="log"></div> 36 </body> 37 </html>