| Xiaoming Shi | 73dfa20 | 2020-03-12 11:31:35 -0700 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <meta name="viewport" content="width=device-width,initial-scale=1"> |
| 3 | <script src="/resources/testharness.js"></script> |
| 4 | <script src="/resources/testharnessreport.js"></script> |
| 5 | <script src="./resources/intersection-observer-test-utils.js"></script> |
| 6 | |
| 7 | <style> |
| 8 | pre, #log { |
| 9 | position: absolute; |
| 10 | top: 0; |
| 11 | left: 200px; |
| 12 | } |
| 13 | #root { |
| 14 | width: 200px; |
| 15 | height: 200px; |
| 16 | overflow: visible; |
| 17 | } |
| 18 | #target { |
| 19 | background-color: green; |
| 20 | } |
| 21 | </style> |
| 22 | |
| 23 | <div id="root"> |
| 24 | <div id="target" style="width: 100px; height: 100px; transform: translateY(250px)"></div> |
| 25 | </div> |
| 26 | |
| 27 | <script> |
| 28 | var entries = []; |
| 29 | |
| 30 | runTestCycle(function() { |
| 31 | var root = document.getElementById('root'); |
| 32 | assert_true(!!root, "root element exists."); |
| 33 | var target = document.getElementById('target'); |
| 34 | assert_true(!!target, "target element exists."); |
| 35 | var observer = new IntersectionObserver(function(changes) { |
| 36 | entries = entries.concat(changes); |
| 37 | }, { root: root }); |
| 38 | observer.observe(target); |
| 39 | entries = entries.concat(observer.takeRecords()); |
| 40 | assert_equals(entries.length, 0, "No initial notifications."); |
| 41 | runTestCycle(step0, "First rAF."); |
| 42 | }, "IntersectionObserver should detect and report edge-adjacent and zero-area intersections."); |
| 43 | |
| 44 | function step0() { |
| 45 | runTestCycle(step1, "Set transform=translateY(200px) on target."); |
| 46 | checkLastEntry(entries, 0, [8, 108, 258, 358, 0, 0, 0, 0, 8, 208, 8, 208, false]); |
| 47 | target.style.transform = "translateY(200px)"; |
| 48 | } |
| 49 | |
| 50 | function step1() { |
| 51 | runTestCycle(step2, "Set transform=translateY(201px) on target."); |
| 52 | checkLastEntry(entries, 1, [8, 108, 208, 308, 8, 108, 208, 208, 8, 208, 8, 208, true]); |
| 53 | target.style.transform = "translateY(201px)"; |
| 54 | } |
| 55 | |
| 56 | function step2() { |
| 57 | runTestCycle(step3, "Set transform=translateY(185px) on target."); |
| 58 | checkLastEntry(entries, 2); |
| 59 | target.style.height = "0px"; |
| 60 | target.style.width = "300px"; |
| 61 | target.style.transform = "translateY(185px)"; |
| 62 | } |
| 63 | |
| 64 | function step3() { |
| 65 | checkLastEntry(entries, 3, [8, 308, 193, 193, 8, 208, 193, 193, 8, 208, 8, 208, true]); |
| 66 | } |
| 67 | </script> |
