LayoutTests/performance-api/performance-observer-callback-task.html - WebKit - Git at Google

 <!DOCTYPE HTML>
 <html>
 <head>
 <script src="../resources/js-test-pre.js"></script>
 </head>
 <body>
 <script>
 description("Test PerformanceObserver callback is a task, not a microtask.");
 window.jsTestIsAsync = true;

 window.microtaskExecuted = false;
 window.callbackCount = 0;
 window.list = null;

 let observer = new PerformanceObserver((list) => {
     window.list = list;
     callbackCount++;

     testPassed("PerformanceObserver callback fired");

     if (callbackCount === 1) {
         shouldBeFalse(`microtaskExecuted`);
         shouldBe(`list.getEntries().length`, `1`);
         performance.mark("mark2");
         Promise.resolve().then(() => {
             testPassed("Promise microtask fired");
             microtaskExecuted = true;
             performance.mark("mark3");
         });
         return;
     }

     if (callbackCount === 2) {
         shouldBe(`list.getEntries().length`, `2`);
         shouldBeTrue(`microtaskExecuted`);
         finishJSTest();
         return;
     }

     testFailed("Callback should not have fired again");
 });

 observer.observe({entryTypes: ["mark"]});
 performance.mark("mark1");
 </script>
 <script src="../resources/js-test-post.js"></script>
 </body>
 </html>
	<!DOCTYPE HTML>
	<html>
	<head>
	<script src="../resources/js-test-pre.js"></script>
	</head>
	<body>
	<script>
	description("Test PerformanceObserver callback is a task, not a microtask.");
	window.jsTestIsAsync = true;

	window.microtaskExecuted = false;
	window.callbackCount = 0;
	window.list = null;

	let observer = new PerformanceObserver((list) => {
	window.list = list;
	callbackCount++;

	testPassed("PerformanceObserver callback fired");

	if (callbackCount === 1) {
	shouldBeFalse(`microtaskExecuted`);
	shouldBe(`list.getEntries().length`, `1`);
	performance.mark("mark2");
	Promise.resolve().then(() => {
	testPassed("Promise microtask fired");
	microtaskExecuted = true;
	performance.mark("mark3");
	});
	return;
	}

	if (callbackCount === 2) {
	shouldBe(`list.getEntries().length`, `2`);
	shouldBeTrue(`microtaskExecuted`);
	finishJSTest();
	return;
	}

	testFailed("Callback should not have fired again");
	});

	observer.observe({entryTypes: ["mark"]});
	performance.mark("mark1");
	</script>
	<script src="../resources/js-test-post.js"></script>
	</body>
	</html>