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

 <!DOCTYPE HTML>
 <html>
 <head>
 <script src="../resources/js-test-pre.js"></script>
 </head>
 <body>
 <script>
 description("Ensure PerformanceObservers are notified in order of registration (observe).");
 window.jsTestIsAsync = true;

 window.count = 0;

 let observer1 = new PerformanceObserver((list) => {
     count++;
     testPassed("PerformanceObserver 1 callback fired");
     shouldBe(`count`, `1`);
 });

 let observer2 = new PerformanceObserver((list) => {
     count++;
     testPassed("PerformanceObserver 2 callback fired");
     shouldBe(`count`, `2`);
 });

 // Ensure creation doesn't impact order.
 let observerSpecial = new PerformanceObserver((list) => {
     count++;
     testPassed("PerformanceObserver 6 callback fired");
     shouldBe(`count`, `6`);
     finishJSTest();
 });

 let observer3 = new PerformanceObserver((list) => {
     count++;
     testPassed("PerformanceObserver 3 callback fired");
     shouldBe(`count`, `3`);
 });

 let observer4 = new PerformanceObserver((list) => {
     count++;
     testPassed("PerformanceObserver 4 callback fired");
     shouldBe(`count`, `4`);
 });

 let observer5 = new PerformanceObserver((list) => {
     count++;
     testPassed("PerformanceObserver 5 callback fired");
     shouldBe(`count`, `5`);
 });

 // Register all in order.
 for (let o of [observer1, observer2, observerSpecial, observer3, observer4, observer5])
     o.observe({entryTypes: ["mark"]});

 // Unregister and re-register moves this to the back of the line.
 observerSpecial.disconnect();
 observerSpecial.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("Ensure PerformanceObservers are notified in order of registration (observe).");
	window.jsTestIsAsync = true;

	window.count = 0;

	let observer1 = new PerformanceObserver((list) => {
	count++;
	testPassed("PerformanceObserver 1 callback fired");
	shouldBe(`count`, `1`);
	});

	let observer2 = new PerformanceObserver((list) => {
	count++;
	testPassed("PerformanceObserver 2 callback fired");
	shouldBe(`count`, `2`);
	});

	// Ensure creation doesn't impact order.
	let observerSpecial = new PerformanceObserver((list) => {
	count++;
	testPassed("PerformanceObserver 6 callback fired");
	shouldBe(`count`, `6`);
	finishJSTest();
	});

	let observer3 = new PerformanceObserver((list) => {
	count++;
	testPassed("PerformanceObserver 3 callback fired");
	shouldBe(`count`, `3`);
	});

	let observer4 = new PerformanceObserver((list) => {
	count++;
	testPassed("PerformanceObserver 4 callback fired");
	shouldBe(`count`, `4`);
	});

	let observer5 = new PerformanceObserver((list) => {
	count++;
	testPassed("PerformanceObserver 5 callback fired");
	shouldBe(`count`, `5`);
	});

	// Register all in order.
	for (let o of [observer1, observer2, observerSpecial, observer3, observer4, observer5])
	o.observe({entryTypes: ["mark"]});

	// Unregister and re-register moves this to the back of the line.
	observerSpecial.disconnect();
	observerSpecial.observe({entryTypes: ["mark"]});

	performance.mark("mark1");
	</script>
	<script src="../resources/js-test-post.js"></script>
	</body>
	</html>