| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8" /> |
| <title>Page Visibility API is Read Only</title> |
| |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script type="text/javascript" src="resources/pagevistestharness.js"></script> |
| |
| <script type="text/javascript"> |
| setup({ explicit_done: true }); |
| function onload_test() |
| { |
| //check for feature definition first before attempting to overwrite |
| pv_test(); |
| |
| //Check document.hidden |
| document.hidden = "new value"; |
| test_true(document.hidden !== "new value", 'document.hidden is read only.'); |
| |
| //Check document.visibilityState |
| document.visibilityState = "new value"; |
| test_true(document.visibilityState !== "new value", |
| "document.visibilityState is read only."); |
| |
| done(); |
| } |
| </script> |
| </head> |
| <body onload="onload_test();"> |
| <h1>Description</h1> |
| <p>This test validates that the Page Visibility attributes are read only.</p> |
| |
| <div id="log"></div> |
| </body> |
| </html> |
