| <!DOCTYPE html> |
| <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: 0px; |
| height: 0px; |
| 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"); |
| }, "Observing a zero-area target."); |
| |
| function step0() { |
| document.scrollingElement.scrollTop = 300; |
| runTestCycle(step1, "document.scrollingElement.scrollTop = 300"); |
| checkLastEntry(entries, 0, [8, 8, vh + 108, vh + 108, 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, 8, vh - 192, vh - 192, 8, 8, vh - 192, vh - 192, 0, vw, 0, vh, true]); |
| } |
| |
| function step2() { |
| document.scrollingElement.scrollTop = 0; |
| checkLastEntry(entries, 2, [8, 8, vh + 8, vh + 8, 0, 0, 0, 0, 0, vw, 0, vh, false]); |
| } |
| </script> |
