| <!DOCTYPE html> |
| <!-- |
| | This test checks that intersection observer events get fired when |
| | intersection information changes as the result of an element in the |
| | containing block chain undergoing a transition. |
| | The target element is initially green when it intersects with the root |
| | element, but when it stops intersecting (as it should after the transition) |
| | it should turn yellow. |
| | https://www.w3.org/TR/intersection-observer/ |
| --> |
| <html> |
| <head> |
| <style> |
| div { |
| margin: 50px; |
| } |
| #static { |
| background-color: red; |
| width: 200px; |
| height: 200px; |
| position: absolute; |
| } |
| #moving { |
| background-color: blue; |
| width: 200px; |
| height: 200px; |
| position: absolute; |
| transition: transform 1s linear; |
| } |
| #target { |
| background-color: green; |
| width: 200px; |
| height: 200px; |
| } |
| </style> |
| </head> |
| <body> |
| <div id="static"> |
| <div id="moving"> |
| <div id="target"> |
| </div> |
| </div> |
| </div> |
| |
| <script> |
| if (window.testRunner) { |
| window.testRunner.waitUntilDone(); |
| } |
| |
| window.addEventListener("load", function() { |
| var staticElement = document.querySelector('#static'); |
| var movingElement = document.querySelector('#moving'); |
| var targetElement = document.querySelector('#target'); |
| |
| function handleIntersect(entries, observer) { |
| entries.forEach(function(entry) { |
| console.log(entry.intersectionRatio); |
| if (entry.intersectionRatio == 0) { |
| entry.target.style.backgroundColor = "yellow"; |
| } |
| }); |
| } |
| |
| function createObserver() { |
| var options = { |
| root: staticElement, |
| rootMargin: "0px", |
| threshold: 0.0 |
| }; |
| |
| var observer = new IntersectionObserver(handleIntersect, options); |
| observer.observe(targetElement); |
| } |
| |
| createObserver(); |
| |
| movingElement.style.transform = "translate(110px, 0)"; |
| |
| if (window.testRunner) { |
| window.testRunner.DoNonMeasuredLayout(); |
| window.testRunner.AdvanceClockByMs(1000); |
| window.testRunner.DoNonMeasuredLayout(); |
| window.setTimeout(function() { window.testRunner.notifyDone(); }, 0); |
| } |
| }); |
| </script> |
| |
| </body> |
| </html> |
