| <!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 entries = []; |
| |
| runTestCycle(function() { |
| var target = document.getElementById("target"); |
| assert_true(!!target, "Target exists"); |
| function createObserver() { |
| new IntersectionObserver(function(changes) { |
| entries = entries.concat(changes) |
| }).observe(target); |
| } |
| createObserver(); |
| runTestCycle(step0, "First rAF"); |
| }, "IntersectionObserver that is unreachable in js should still generate notifications."); |
| |
| function step0() { |
| document.scrollingElement.scrollTop = 300; |
| runTestCycle(step1, "document.scrollingElement.scrollTop = 300"); |
| assert_equals(entries.length, 1, "One notification."); |
| } |
| |
| function step1() { |
| document.scrollingElement.scrollTop = 0; |
| assert_equals(entries.length, 2, "Two notifications."); |
| } |
| </script> |
