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.