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1 <!DOCTYPE html> | |
2 <script src="../resources/js-test.js"></script> | |
3 <script src="helper-functions.js"></script> | |
4 <div id="beforeFrame" style="width:100%; height:700px;"></div> | |
5 <div id="afterFrame" style="width:100%; height:700px;"></div> | |
6 | |
7 <script> | |
8 description("Test that intersection observer time is relative to time in the cal lback context."); | |
9 var topWindowEntries = []; | |
10 var iframeWindowEntries = []; | |
11 var targetIframe; | |
12 var iframeScroller; | |
13 var topWindowTime; | |
14 var iframeWindowTime; | |
15 var timestampTolerance = 24; // 1.5 times frame duration. | |
16 | |
17 function step0() { | |
18 setTimeout(function() { | |
ojan
2016/02/03 01:46:28
Why do you need the setTimeout?
szager1
2016/02/03 01:54:45
The setTimeout's are to allow the IO notifications
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19 // Test results are only significant if there's a sufficient gap between | |
20 // top window time and iframe window time. | |
21 topWindowTime = performance.now(); | |
22 iframeWindowTime = targetIframe.contentWindow.performance.now(); | |
23 shouldBeGreaterThan("topWindowTime - iframeWindowTime", "2 * timestampTolera nce"); | |
24 | |
25 shouldBeEqualToNumber("topWindowEntries.length", 0); | |
26 shouldBeEqualToNumber("iframeWindowEntries.length", 0); | |
27 document.scrollingElement.scrollTop = 200; | |
28 iframeScroller.scrollTop = 250; | |
29 requestAnimationFrame(step1); | |
30 }); | |
31 } | |
32 | |
33 function step1() { | |
34 setTimeout(function() { | |
ojan
2016/02/03 01:46:28
Ditto.
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35 topWindowTime = performance.now(); | |
36 iframeWindowTime = targetIframe.contentWindow.performance.now(); | |
37 shouldBeEqualToNumber("topWindowEntries.length", 1); | |
38 if (topWindowEntries.length) { | |
39 shouldBeCloseTo("topWindowEntries[0].time", "topWindowTime", timestampTole rance); | |
40 } | |
41 shouldBeEqualToNumber("iframeWindowEntries.length", 1); | |
42 if (iframeWindowEntries.length) { | |
43 shouldBeCloseTo("iframeWindowEntries[0].time", "iframeWindowTime", timesta mpTolerance); | |
44 } | |
45 finishTest(); | |
46 document.scrollingElement.scrollTop = 0; | |
47 }); | |
48 } | |
49 | |
50 function runTest() { | |
51 var target = targetIframe.contentDocument.getElementById("target"); | |
52 iframeScroller = targetIframe.contentDocument.scrollingElement; | |
53 | |
54 // Observer created here, callback created in iframe context. Timestamps shou ld be | |
55 // from this window. | |
56 var observer = new IntersectionObserver(targetIframe.contentDocument.createObs erverCallback(topWindowEntries), {}); | |
57 observer.observe(target); | |
58 | |
59 // Callback created here, observer created in iframe. Timestamps should be | |
60 // from iframe window. | |
61 observer = targetIframe.contentDocument.createObserver(function(newEntries) { | |
62 for (var i = 0; i < newEntries.length; i++) | |
63 iframeWindowEntries.push(newEntries[i]); | |
64 }); | |
65 observer.observe(target); | |
66 | |
67 step0(); | |
68 } | |
69 | |
70 window.onload = function() { | |
71 setTimeout(function() { | |
72 targetIframe = document.createElement("iframe"); | |
73 targetIframe.src = "../resources/intersection-observer-timestamp-subframe.ht ml"; | |
74 targetIframe.style = "height: 100px; overflow-y: scroll"; | |
75 var afterFrame = document.getElementById("afterFrame"); | |
76 afterFrame.parentNode.insertBefore(targetIframe, afterFrame); | |
77 targetIframe.onload = runTest; | |
78 }, 100); | |
79 }; | |
80 | |
81 </script> | |
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