<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>window.performance is read/write</title> <link rel="author" title="Microsoft" href="http://www.microsoft.com/" /> <link rel="help" href="http://www.w3.org/TR/navigation-timing/#sec-window.performance-attribute"/> <meta name="assert" content="The window.performance attribute provides a hosting area for performance related attributes. "/> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="/common/performance-timeline-utils.js"></script> <script src="resources/webperftestharness.js"></script> </head> <body> <h1>Description</h1> <p>This test validates that the window.performance object is read/write.</p> <div id="log"></div> <script> test_namespace(); window.performance = 'foo'; test_equals(window.performance, 'foo', 'window.performance is read/write'); var performance = 'bar'; test_equals(performance, 'bar', 'var performance is read/write'); </script> </body> </html>