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| 1 <!DOCTYPE html> | |
| 2 <script src="/js-test-resources/intersection-observer-helper-functions.js"></scr
ipt> | |
| 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 // Use a rootMargin here, and verify it does NOT get applied for the cross-origi
n case. | |
| 18 var observer = new IntersectionObserver( | |
| 19 changes => { entries = entries.concat(changes) }, | |
| 20 { rootMargin: "7px" } | |
| 21 ); | |
| 22 observer.observe(target); | |
| 23 | |
| 24 function step0() { | |
| 25 entries = entries.concat(observer.takeRecords()); | |
| 26 nextStep = step1; | |
| 27 port.postMessage({actual: entries.map(entryToJson), expected: []}, "*"); | |
| 28 entries = []; | |
| 29 port.postMessage({scrollTo: 200}, "*"); | |
| 30 } | |
| 31 | |
| 32 function step1() { | |
| 33 entries = entries.concat(observer.takeRecords()); | |
| 34 port.postMessage({actual: entries.map(entryToJson), expected: []}, "*"); | |
| 35 entries = []; | |
| 36 scroller.scrollTop = 250; | |
| 37 nextStep = step2; | |
| 38 port.postMessage({}, "*"); | |
| 39 } | |
| 40 | |
| 41 function step2() { | |
| 42 entries = entries.concat(observer.takeRecords()); | |
| 43 var expected = [{ | |
| 44 boundingClientRect: coordinatesToClientRectJson(-42, 108, 58, 8), | |
| 45 intersectionRect: coordinatesToClientRectJson(0, 108, 58, 8), | |
| 46 rootBounds: "null", | |
| 47 target: target.id | |
| 48 }]; | |
| 49 port.postMessage({actual: entries.map(entryToJson), expected: expected}, "*"); | |
| 50 entries = []; | |
| 51 nextStep = step3; | |
| 52 port.postMessage({scrollTo: 100}, "*"); | |
| 53 } | |
| 54 | |
| 55 function step3() { | |
| 56 entries = entries.concat(observer.takeRecords()); | |
| 57 var expected = [{ | |
| 58 boundingClientRect: coordinatesToClientRectJson(-42, 108, 58, 8), | |
| 59 intersectionRect: coordinatesToClientRectJson(0, 0, 0, 0), | |
| 60 rootBounds: "null", | |
| 61 target: target.id | |
| 62 }]; | |
| 63 port.postMessage({actual: entries.map(entryToJson), expected: expected}, "*"); | |
| 64 port.postMessage({DONE: 1}, "*"); | |
| 65 } | |
| 66 | |
| 67 function handleMessage(event) | |
| 68 { | |
| 69 port = event.source; | |
| 70 nextStep(); | |
| 71 } | |
| 72 | |
| 73 nextStep = step0; | |
| 74 window.addEventListener("message", handleMessage); | |
| 75 </script> | |
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Chromium Code Reviews
Issue 2560253004:
IntersectionObserver: convert tests to testharness.js (Closed)
