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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <script src="helper-functions.js"></script> |
| 3 <div style="height: 200px; width: 100px;"></div> |
| 4 <div id="target" style="background-color: green; width:100px; height:100px"></di
v> |
| 5 <div style="height: 200px; width: 100px;"></div> |
| 6 <script> |
| 7 var port; |
| 8 var entries = []; |
| 9 var target = document.getElementById('target'); |
| 10 var scroller = document.scrollingElement; |
| 11 var nextStep; |
| 12 |
| 13 // Note that we never use RAF in this code, because this frame might get render-
throttled. |
| 14 // Instead of RAF-ing, we just post an empty message to the parent window, which
will |
| 15 // RAF when it is received, and then send us a message to cause the next step to
run. |
| 16 |
| 17 function observer_callback(changes) { |
| 18 for (var i in changes) |
| 19 entries.push(changes[i]); |
| 20 } |
| 21 var observer = new IntersectionObserver(observer_callback, {}); |
| 22 observer.observe(target); |
| 23 |
| 24 function step0() { |
| 25 setTimeout(function() { |
| 26 nextStep = step1; |
| 27 port.postMessage({actual: entries.map(entryToJson), expected: []}, "*"); |
| 28 entries = []; |
| 29 port.postMessage({scrollTo: 200}, "*"); |
| 30 }); |
| 31 } |
| 32 |
| 33 function step1() { |
| 34 setTimeout(function() { |
| 35 port.postMessage({actual: entries.map(entryToJson), expected: []}, "*"); |
| 36 entries = []; |
| 37 scroller.scrollTop = 250; |
| 38 nextStep = step2; |
| 39 port.postMessage({}, "*"); |
| 40 }); |
| 41 } |
| 42 |
| 43 function step2() { |
| 44 setTimeout(function() { |
| 45 var expected = [{ |
| 46 boundingClientRect: coordinatesToClientRectJson(468, 118, 568, 18), |
| 47 intersectionRect: coordinatesToClientRectJson(510, 118, 568, 18), |
| 48 rootBounds: "null", |
| 49 target: target.id |
| 50 }]; |
| 51 port.postMessage({actual: entries.map(entryToJson), expected: expected}, "*"
); |
| 52 entries = []; |
| 53 nextStep = step3; |
| 54 port.postMessage({scrollTo: 100}, "*"); |
| 55 }); |
| 56 } |
| 57 |
| 58 function step3() { |
| 59 setTimeout(function() { |
| 60 var expected = [{ |
| 61 boundingClientRect: coordinatesToClientRectJson(568, 118, 668, 18), |
| 62 intersectionRect: coordinatesToClientRectJson(0, 0, 0, 0), |
| 63 rootBounds: "null", |
| 64 target: target.id |
| 65 }]; |
| 66 port.postMessage({actual: entries.map(entryToJson), expected: expected}, "*"
); |
| 67 port.postMessage({DONE: 1}, "*"); |
| 68 }); |
| 69 } |
| 70 |
| 71 function handleMessage(event) |
| 72 { |
| 73 port = event.source; |
| 74 nextStep(); |
| 75 } |
| 76 |
| 77 nextStep = step0; |
| 78 window.addEventListener("message", handleMessage); |
| 79 </script> |
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Chromium Code Reviews
Issue 1615573002:
Set rootBounds to null for cross-origin observations. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src@master