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| 1 <!DOCTYPE html> |
| 2 <script src="/resources/testharness.js"></script> |
| 3 <script src="/resources/testharnessreport.js"></script> |
| 4 <script src="./resources/intersection-observer-test-utils.js"></script> |
| 5 |
| 6 <style> |
| 7 pre, #log { |
| 8 position: absolute; |
| 9 top: 0; |
| 10 left: 200px; |
| 11 } |
| 12 .spacer { |
| 13 height: calc(100vh + 100px); |
| 14 } |
| 15 .target { |
| 16 width: 100px; |
| 17 height: 100px; |
| 18 margin: 10px; |
| 19 background-color: green; |
| 20 } |
| 21 </style> |
| 22 |
| 23 <div class="spacer"></div> |
| 24 <div id="target1" class="target"></div> |
| 25 <div id="target2" class="target"></div> |
| 26 <div id="target3" class="target"></div> |
| 27 |
| 28 <script> |
| 29 var entries = []; |
| 30 var target1, target2, target3; |
| 31 |
| 32 runTestCycle(function() { |
| 33 target1 = document.getElementById("target1"); |
| 34 assert_true(!!target1, "target1 exists."); |
| 35 target2 = document.getElementById("target2"); |
| 36 assert_true(!!target2, "target2 exists."); |
| 37 target3 = document.getElementById("target3"); |
| 38 assert_true(!!target3, "target3 exists."); |
| 39 var observer = new IntersectionObserver(function(changes) { |
| 40 entries = entries.concat(changes) |
| 41 }); |
| 42 observer.observe(target1); |
| 43 observer.observe(target2); |
| 44 observer.observe(target3); |
| 45 entries = entries.concat(observer.takeRecords()); |
| 46 assert_equals(entries.length, 0, "No initial notifications."); |
| 47 runTestCycle(step0, "First rAF."); |
| 48 }, "One observer with multiple targets."); |
| 49 |
| 50 function step0() { |
| 51 document.scrollingElement.scrollTop = 150; |
| 52 runTestCycle(step1, "document.scrollingElement.scrollTop = 150"); |
| 53 assert_equals(entries.length, 3, "Three initial notifications."); |
| 54 assert_equals(entries[0].target, target1, "entries[0].target === target1"); |
| 55 assert_equals(entries[1].target, target2, "entries[1].target === target2"); |
| 56 assert_equals(entries[2].target, target3, "entries[2].target === target3"); |
| 57 } |
| 58 |
| 59 function step1() { |
| 60 document.scrollingElement.scrollTop = 10000; |
| 61 runTestCycle(step2, "document.scrollingElement.scrollTop = 10000"); |
| 62 assert_equals(entries.length, 4, "Four notifications."); |
| 63 assert_equals(entries[3].target, target1, "entries[3].target === target1"); |
| 64 } |
| 65 |
| 66 function step2() { |
| 67 document.scrollingElement.scrollTop = 0; |
| 68 runTestCycle(step3, "document.scrollingElement.scrollTop = 0"); |
| 69 assert_equals(entries.length, 6, "Six notifications."); |
| 70 assert_equals(entries[4].target, target2, "entries[4].target === target2"); |
| 71 assert_equals(entries[5].target, target3, "entries[5].target === target3"); |
| 72 } |
| 73 |
| 74 function step3() { |
| 75 assert_equals(entries.length, 9, "Nine notifications."); |
| 76 assert_equals(entries[6].target, target1, "entries[6].target === target1"); |
| 77 assert_equals(entries[7].target, target2, "entries[7].target === target2"); |
| 78 assert_equals(entries[8].target, target3, "entries[8].target === target3"); |
| 79 } |
| 80 </script> |
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