<!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; background-color: green; } </style> <div class="spacer"></div> <div id="target"></div> <div class="spacer"></div> <script> var vw = document.documentElement.clientWidth; var vh = document.documentElement.clientHeight; var entries = []; var target; runTestCycle(function() { target = document.getElementById("target"); assert_true(!!target, "target exists"); var observer = new IntersectionObserver(function(changes) { entries = entries.concat(changes) }); observer.observe(target); entries = entries.concat(observer.takeRecords()); assert_equals(entries.length, 0, "No initial notifications."); runTestCycle(step0, "First rAF."); }, "IntersectionObserver in a single document using the implicit root."); function step0() { document.scrollingElement.scrollTop = 300; runTestCycle(step1, "document.scrollingElement.scrollTop = 300"); checkLastEntry(entries, 0, [8, 108, vh + 108, vh + 208, 0, 0, 0, 0, 0, vw, 0, vh, false]); } function step1() { document.scrollingElement.scrollTop = 100; runTestCycle(step2, "document.scrollingElement.scrollTop = 100"); checkLastEntry(entries, 1, [8, 108, vh - 192, vh - 92, 8, 108, vh - 192, vh - 92, 0, vw, 0, vh, true]); } function step2() { document.scrollingElement.scrollTop = 0; checkLastEntry(entries, 2, [8, 108, vh + 8, vh + 108, 0, 0, 0, 0, 0, vw, 0, vh, false]); } </script>