| <!DOCTYPE html><!-- webkit-test-runner [ enableIntersectionObserver=true ] --> |
| <head> |
| <script src="../resources/testharness.js"></script> |
| <script src="../resources/testharnessreport.js"></script> |
| <body> |
| |
| <div id="root" style="position:absolute"> |
| <div id="target" style="width: 100px; height: 100px; background-color: green"></div> |
| </div> |
| |
| <script> |
| var observer; |
| var root = document.getElementById('root'); |
| var target = document.getElementById('target'); |
| test(function() { |
| observer = new IntersectionObserver(function() {}, { root: document.getElementById('root') });; |
| assert_equals(observer.root, root); |
| observer.observe(target); |
| assert_equals(internals.numberOfIntersectionObservers(document), 1); |
| document.body.appendChild(target); |
| var newDoc = document.implementation.createHTMLDocument('New document'); |
| newDoc.body.appendChild(root); |
| assert_equals(internals.numberOfIntersectionObservers(document), 0); |
| assert_equals(internals.numberOfIntersectionObservers(newDoc), 1); |
| document.body.appendChild(root); |
| assert_equals(internals.numberOfIntersectionObservers(document), 1); |
| assert_equals(internals.numberOfIntersectionObservers(newDoc), 0); |
| },"Document's active intersection observers get updated"); |
| </script> |
| </body> |
| </html> |
