| <!DOCTYPE html> | |
| <style> | |
| #target { | |
| width: 100px; | |
| height: 100px; | |
| background-color: green; | |
| } | |
| .spacer { | |
| width: height: 100px | |
| } | |
| </style> | |
| <div class="spacer"></div> | |
| <div id="target"></div> | |
| <div class="spacer"></div> | |
| <script> | |
| document.createObserverCallback = function(entries) { | |
| return function(newEntries) { | |
| for (var i in newEntries) { | |
| entries.push(newEntries[i]); | |
| } | |
| }; | |
| } | |
| document.createObserver = function(callback) { | |
| return new IntersectionObserver(callback, {}); | |
| }; | |
| </script> |