third_party/WebKit/LayoutTests/http/tests/performance-timing/paint-timing/first-contentful-paint.html - Issue 2932593002: Attempt 2: Update PaintTiming Web Perf APIs for FP & FCP to report swap time

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Issue 2932593002: Attempt 2: Update PaintTiming Web Perf APIs for FP & FCP to report swap time (Closed)

Patch Set: rebase to head Created 3 years, 6 months ago

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1 <!DOCTYPE html>	1 <!DOCTYPE html>

2 <head>	2 <head>

3 <title>Performance Paint Timing Test</title>	3 <title>Performance Paint Timing Test: FP followed by FCP</title>

4 </head>	4 </head>

5 <body>	5 <body>

6 <script src="../../resources/testharness.js"></script>	6 <script src="../../resources/testharness.js"></script>

7 <script src="../../resources/testharnessreport.js"></script>	7 <script src="../../resources/testharnessreport.js"></script>

	8 <div id="main"></div>

8 <div id="image"></div>	9 <div id="image"></div>

9	10

10 <script>	11 <script>

11 async_test(function (t) {	12 async_test(function (t) {

12 var observer = new PerformanceObserver(	13 testRunner.capturePixelsAsyncThen(t.step_func(function() {

13 t.step_func(function (entryList) {	14 const bufferedEntries = performance.getEntriesByType('paint');

14 var entries = entryList.getEntries();	15 assert_equals(bufferedEntries.length, 0, "No paint entries yet");

15 // Nothing contentful to be painted yet.

16 assert_equals(entries.length, 1,

17 "There should be only one paint timing instance delivered at a time.");

18 assert_equals(entries[0].entryType, "paint",

19 "Expected entryType to be: paint.");

20 if (entries[0].name == "first-paint") {

21 t.first_paint_time = entries[0].startTime;

22 } else if (entries[0].name == "first-contentful-paint") {

23 assert_not_equals(t.first_paint_time, "");

24 t.first_contentful_paint_time = entries[0].startTime;

25 assert_greater_than(t.first_contentful_paint_time - t.first_ paint_time, 100);

26 observer.disconnect();

27 t.done();

28 }

29 })

30 );

31 observer.observe({entryTypes: ["paint"]});

32	16

33 // Wait 100ms, then load image	17 const div = document.createElement("div");

34 setTimeout(function() {	18 div.style.width = "100px";

35 var img = document.createElement("IMG");	19 div.style.height = "100px";

36 img.src = "resources/circles.png";	20 div.style.backgroundColor = "red";

37 document.getElementById('image').appendChild(img);	21 div.style.color = "blue";

38 }, 100);	22 document.getElementById("main").appendChild(div);

39 }, "First Paint triggered by non-contentful paint. Image load triggers First Contentful Paint.");

40	23

	24 testRunner.capturePixelsAsyncThen(t.step_func(function() {

	25 const bufferedEntries = performance.getEntriesByType('paint');

	26 assert_equals(bufferedEntries.length, 1, "FP only.");

	27 assert_equals(bufferedEntries[0].entryType, "paint");

	28 assert_equals(bufferedEntries[0].name, "first-paint");

	29

	30 const img = document.createElement("IMG");

	31 img.src = "resources/circles.png";

	32 img.onload = function() {

	33 testRunner.capturePixelsAsyncThen(t.step_func_done(function( ) {

	34 const bufferedEntries = performance.getEntriesByType('pa int');

	35 assert_equals(bufferedEntries.length, 2, "FP and FCP.");

	36 assert_equals(bufferedEntries[0].entryType, "paint");

	37 assert_equals(bufferedEntries[0].name, "first-paint");

	38 assert_equals(bufferedEntries[1].entryType, "paint");

	39 assert_equals(bufferedEntries[1].name, "first-contentful -paint");

	40 }));

	41 };

	42 document.getElementById('image').appendChild(img);

	43 }));

	44 }));

	45 }, "First Paint triggered by non-contentful paint. Image load triggers Fir st Contentful Paint.");

41 </script>	46 </script>

42 <div style="background-color:black;color:white;padding:20px;"></div>

43

44

45 </body>	47 </body>

46 </html>	48 </html>

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