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Issue 2645283008: IntersectionObserver: Always send an initial notification. (Closed)
Patch Set: Fix unit test Created 3 years, 10 months ago
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1 <!DOCTYPE html> 1 <!DOCTYPE html>
2 <div style="height: 200px; width: 100px;"></div> 2 <div style="height: 200px; width: 100px;"></div>
3 <div id="target" style="background-color: green; width:100px; height:100px"></di v> 3 <div id="target" style="background-color: green; width:100px; height:100px"></di v>
4 <div style="height: 200px; width: 100px;"></div> 4 <div style="height: 200px; width: 100px;"></div>
5 5
6 <script> 6 <script>
7 var port; 7 var port;
8 var entries = []; 8 var entries = [];
9 var target = document.getElementById('target'); 9 var target = document.getElementById('target');
10 var scroller = document.scrollingElement; 10 var scroller = document.scrollingElement;
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45 45
46 // Use a rootMargin here, and verify it does NOT get applied for the cross-origi n case. 46 // Use a rootMargin here, and verify it does NOT get applied for the cross-origi n case.
47 var observer = new IntersectionObserver(function(changes) { 47 var observer = new IntersectionObserver(function(changes) {
48 entries = entries.concat(changes) 48 entries = entries.concat(changes)
49 }, { rootMargin: "7px" }); 49 }, { rootMargin: "7px" });
50 observer.observe(target); 50 observer.observe(target);
51 51
52 function step0() { 52 function step0() {
53 entries = entries.concat(observer.takeRecords()); 53 entries = entries.concat(observer.takeRecords());
54 nextStep = step1; 54 nextStep = step1;
55 var expected = [{
56 boundingClientRect: coordinatesToClientRectJson(8, 208, 108, 308),
57 intersectionRect: coordinatesToClientRectJson(0, 0, 0, 0),
58 rootBounds: "null",
59 target: target.id
60 }];
55 port.postMessage({ 61 port.postMessage({
56 actual: entries.map(entryToJson), 62 actual: entries.map(entryToJson),
57 expected: [], 63 expected: expected,
58 description: "First rAF" 64 description: "First rAF"
59 }, "*"); 65 }, "*");
60 entries = []; 66 entries = [];
61 port.postMessage({scrollTo: 200}, "*"); 67 port.postMessage({scrollTo: 200}, "*");
62 } 68 }
63 69
64 function step1() { 70 function step1() {
65 entries = entries.concat(observer.takeRecords()); 71 entries = entries.concat(observer.takeRecords());
66 port.postMessage({ 72 port.postMessage({
67 actual: entries.map(entryToJson), 73 actual: entries.map(entryToJson),
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110 116
111 function handleMessage(event) 117 function handleMessage(event)
112 { 118 {
113 port = event.source; 119 port = event.source;
114 nextStep(); 120 nextStep();
115 } 121 }
116 122
117 nextStep = step0; 123 nextStep = step0;
118 window.addEventListener("message", handleMessage); 124 window.addEventListener("message", handleMessage);
119 </script> 125 </script>
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