| <!DOCTYPE html> |
| <meta name="viewport" content="width=device-width,initial-scale=1"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="./resources/intersection-observer-test-utils.js"></script> |
| |
| <style> |
| pre, #log { |
| position: absolute; |
| top: 0; |
| left: 200px; |
| } |
| #root { |
| width: 200px; |
| height: 200px; |
| overflow: visible; |
| } |
| #target { |
| background-color: green; |
| } |
| </style> |
| |
| <div id="root"> |
| <div id="target" style="width: 100px; height: 100px; transform: translateY(250px)"></div> |
| </div> |
| |
| <script> |
| var entries = []; |
| |
| runTestCycle(function() { |
| var root = document.getElementById('root'); |
| assert_true(!!root, "root element exists."); |
| var target = document.getElementById('target'); |
| assert_true(!!target, "target element exists."); |
| var observer = new IntersectionObserver(function(changes) { |
| entries = entries.concat(changes); |
| }, { root: root }); |
| observer.observe(target); |
| entries = entries.concat(observer.takeRecords()); |
| assert_equals(entries.length, 0, "No initial notifications."); |
| runTestCycle(step0, "First rAF."); |
| }, "IntersectionObserver should detect and report edge-adjacent and zero-area intersections."); |
| |
| function step0() { |
| runTestCycle(step1, "Set transform=translateY(200px) on target."); |
| checkLastEntry(entries, 0, [8, 108, 258, 358, 0, 0, 0, 0, 8, 208, 8, 208, false]); |
| target.style.transform = "translateY(200px)"; |
| } |
| |
| function step1() { |
| runTestCycle(step2, "Set transform=translateY(201px) on target."); |
| checkLastEntry(entries, 1, [8, 108, 208, 308, 8, 108, 208, 208, 8, 208, 8, 208, true]); |
| target.style.transform = "translateY(201px)"; |
| } |
| |
| function step2() { |
| runTestCycle(step3, "Set transform=translateY(185px) on target."); |
| checkLastEntry(entries, 2); |
| target.style.height = "0px"; |
| target.style.width = "300px"; |
| target.style.transform = "translateY(185px)"; |
| } |
| |
| function step3() { |
| checkLastEntry(entries, 3, [8, 308, 193, 193, 8, 208, 193, 193, 8, 208, 8, 208, true]); |
| } |
| </script> |
