Function markTime

test/fixtures/wpt/hr-time/resources/unload.js:9–22

(docName, lifecycleEventName)

};

const markTime = (docName, lifecycleEventName) => {
  // Calculating these values before the below `mark` invocation ensures that delays in
  // reaching across to the other window object doesn't interfere with the correctness
  // of the test.
  const dateNow = Date.now();
  const performanceNow = performance.now();

  window.opener.mark({
    docName,
    lifecycleEventName,
    performanceNow: performanceNow,
    dateNow: dateNow
  });
};

const setupUnloadPrompt = (docName, msg) => {
  window.addEventListener("beforeunload", ev => {