| <!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> |
| <div style="position: fixed; top: 0; left: 0"> |
| <div id="target" style="width: 100px; height: 100px"></div> |
| </div> |
| <div id="log" style="height: 2000px"></div> |
| <script> |
| var entries = []; |
| |
| runTestCycle(function() { |
| 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.'); |
| }, 'Fixed-position intersection observer on scroll'); |
| |
| function step0() { |
| window.scrollTo(0, 1000); |
| runTestCycle(step1, 'scrollTo(0, 1000)'); |
| checkLastEntry(entries, 0, |
| [0, 100, 0, 100, 0, 100, 0, 100, 0, |
| document.documentElement.clientWidth, 0, document.documentElement.clientHeight, |
| true]); |
| } |
| |
| function step1() { |
| window.scrollTo(0, 0); |
| checkLastEntry(entries, 0, |
| [0, 100, 0, 100, 0, 100, 0, 100, 0, |
| document.documentElement.clientWidth, 0, document.documentElement.clientHeight, |
| true]); |
| } |
| </script> |
