| This is a testharness.js-based test. | |
| [FAIL] When converting 'navigationStart' to a timestamp and a mark named 'navigationStart' exists, the global object has to be a Window object. | |
| assert_throws_js: function "() => {\n performance.mark('navigationStart');\n performance.measure('name', 'navigationStart', 'navigationStart');\n }" did not throw | |
| Harness: the test ran to completion. | |