fixed-position-scroll.html (1359B)
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 <div id="target" style="width: 100px; height: 100px; position: fixed; top: 0; left: 0"></div> 7 <div id="log" style="height: 2000px"></div> 8 <script> 9 var entries = []; 10 11 runTestCycle(function() { 12 var observer = new IntersectionObserver(function(changes) { 13 entries = entries.concat(changes) 14 }); 15 observer.observe(target); 16 entries = entries.concat(observer.takeRecords()); 17 assert_equals(entries.length, 0, 'No initial notifications.'); 18 runTestCycle(step0, 'First rAF.'); 19 }, 'Fixed-position intersection observer on scroll'); 20 21 function step0() { 22 window.scrollTo(0, 1000); 23 runTestCycle(step1, 'scrollTo(0, 1000)'); 24 checkLastEntry(entries, 0, 25 [0, 100, 0, 100, 0, 100, 0, 100, 0, 26 document.documentElement.clientWidth, 0, document.documentElement.clientHeight, 27 true]); 28 } 29 30 function step1() { 31 window.scrollTo(0, 0); 32 checkLastEntry(entries, 0, 33 [0, 100, 0, 100, 0, 100, 0, 100, 0, 34 document.documentElement.clientWidth, 0, document.documentElement.clientHeight, 35 true]); 36 } 37 </script>