| <!DOCTYPE html> |
| <!-- |
| | This test checks that the observers no longer check the intersections |
| | for targets that have been unobserved. |
| | Observed targets become green if they intersect with the root (i.e. are |
| | visible on the screen). Unobserved targets do not change color. |
| | https://www.w3.org/TR/intersection-observer/ |
| --> |
| <html> |
| <head> |
| <style> |
| div { |
| background-color: yellow; |
| width: 50px; |
| height: 100px; |
| margin: 25px; |
| display: inline-block; |
| } |
| </style> |
| </head> |
| <body> |
| <div id="firsttarget"></div> |
| <div id="secondtarget"></div> |
| <div id="thirdtarget"></div> |
| <div id="fourthtarget"></div> |
| <div id="fifthtarget"></div> |
| |
| <script> |
| if (window.testRunner) { |
| window.testRunner.waitUntilDone(); |
| } |
| |
| window.addEventListener("load", function() { |
| |
| function handleIntersect(entries, observer) { |
| entries.forEach(function(entry) { |
| if (entry.isIntersecting) { |
| entry.target.style.backgroundColor = "green"; |
| } |
| }); |
| } |
| |
| function createObserverAndUnobserveTargets() { |
| var firstTargetElement = document.querySelector('#firsttarget'); |
| var secondTargetElement = document.querySelector('#secondtarget'); |
| var thirdTargetElement = document.querySelector('#thirdtarget'); |
| var fourthTargetElement = document.querySelector('#fourthtarget'); |
| var fifthTargetElement = document.querySelector('#fifthtarget'); |
| |
| var options = { |
| root: null, |
| rootMargin: "0px", |
| threshold: 0.0 |
| }; |
| |
| // Create observer and observe elements. |
| var observer = new IntersectionObserver(handleIntersect, options); |
| observer.observe(firstTargetElement); |
| observer.observe(secondTargetElement); |
| observer.observe(thirdTargetElement); |
| observer.observe(fourthTargetElement); |
| observer.observe(fifthTargetElement); |
| |
| // Unobserve some of these targets. When the observer checks for |
| // intersections, these elements should not be included. |
| observer.unobserve(secondTargetElement); |
| observer.unobserve(fourthTargetElement); |
| observer.unobserve(fifthTargetElement); |
| } |
| |
| createObserverAndUnobserveTargets(); |
| |
| if (window.testRunner) { |
| window.testRunner.DoNonMeasuredLayout(); |
| window.setTimeout(function() { window.testRunner.notifyDone(); }, 0); |
| } |
| }); |
| </script> |
| |
| </body> |
| </html> |
