| <!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; |
| } |
| .spacer { |
| height: calc(100vh + 100px); |
| } |
| .target { |
| width: 100px; |
| height: 100px; |
| margin: 10px; |
| background-color: green; |
| } |
| </style> |
| |
| <div class="spacer"></div> |
| <div id="target1" class="target"></div> |
| <div id="target2" class="target"></div> |
| <div id="target3" class="target"></div> |
| |
| <script> |
| var entries = []; |
| var target1, target2, target3; |
| |
| runTestCycle(function() { |
| target1 = document.getElementById("target1"); |
| assert_true(!!target1, "target1 exists."); |
| target2 = document.getElementById("target2"); |
| assert_true(!!target2, "target2 exists."); |
| target3 = document.getElementById("target3"); |
| assert_true(!!target3, "target3 exists."); |
| var observer = new IntersectionObserver(function(changes) { |
| entries = entries.concat(changes) |
| }); |
| observer.observe(target1); |
| observer.observe(target2); |
| observer.observe(target3); |
| entries = entries.concat(observer.takeRecords()); |
| assert_equals(entries.length, 0, "No initial notifications."); |
| runTestCycle(step0, "First rAF."); |
| }, "One observer with multiple targets."); |
| |
| function step0() { |
| document.scrollingElement.scrollTop = 150; |
| runTestCycle(step1, "document.scrollingElement.scrollTop = 150"); |
| assert_equals(entries.length, 3, "Three initial notifications."); |
| assert_equals(entries[0].target, target1, "entries[0].target === target1"); |
| assert_equals(entries[1].target, target2, "entries[1].target === target2"); |
| assert_equals(entries[2].target, target3, "entries[2].target === target3"); |
| } |
| |
| function step1() { |
| document.scrollingElement.scrollTop = 10000; |
| runTestCycle(step2, "document.scrollingElement.scrollTop = 10000"); |
| assert_equals(entries.length, 4, "Four notifications."); |
| assert_equals(entries[3].target, target1, "entries[3].target === target1"); |
| } |
| |
| function step2() { |
| document.scrollingElement.scrollTop = 0; |
| runTestCycle(step3, "document.scrollingElement.scrollTop = 0"); |
| assert_equals(entries.length, 6, "Six notifications."); |
| assert_equals(entries[4].target, target2, "entries[4].target === target2"); |
| assert_equals(entries[5].target, target3, "entries[5].target === target3"); |
| } |
| |
| function step3() { |
| assert_equals(entries.length, 9, "Nine notifications."); |
| assert_equals(entries[6].target, target1, "entries[6].target === target1"); |
| assert_equals(entries[7].target, target2, "entries[7].target === target2"); |
| assert_equals(entries[8].target, target3, "entries[8].target === target3"); |
| } |
| </script> |
