| <!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: 170px; |
| height: 200px; |
| overflow-y: scroll; |
| } |
| #target { |
| width: 100px; |
| height: 100px; |
| background-color: green; |
| position: absolute; |
| } |
| </style> |
| |
| <div id="root" style="position: absolute"> |
| <div id="target" style="left: 50px; top: 250px"></div> |
| </div> |
| |
| <script> |
| var entries = []; |
| var root, target; |
| |
| runTestCycle(function() { |
| root = document.getElementById("root"); |
| assert_true(!!root, "root element exists."); |
| 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."); |
| target.style.top = "10px"; |
| runTestCycle(test1, "In containing block and intersecting."); |
| }, "IntersectionObserver should only report intersections if root is a containing block ancestor of target."); |
| |
| function test1() { |
| runTestCycle(test2, "In containing block and not intersecting."); |
| var rootBounds = contentBounds(root); |
| checkLastEntry(entries, 0, [58, 158, 18, 118, 58, 158, 18, 118].concat(rootBounds)); |
| target.style.top = "250px"; |
| } |
| |
| function test2() { |
| runTestCycle(test3, "Not in containing block and intersecting."); |
| var rootBounds = contentBounds(root); |
| checkLastEntry(entries, 1, [58, 158, 258, 358, 0, 0, 0, 0].concat(rootBounds)); |
| root.style.position = "static"; |
| target.style.top = "10px"; |
| } |
| |
| function test3() { |
| runTestCycle(test4, "Not in containing block and not intersecting."); |
| checkLastEntry(entries, 1); |
| target.style.top = "250px"; |
| } |
| |
| function test4() { |
| checkLastEntry(entries, 1); |
| target.style.top = "0"; |
| } |
| </script> |
