| <!DOCTYPE html> |
| <!-- |
| | This test checks that the intersection ratios are correctly computed when |
| | there are multiple intersection observers. |
| | The target elements are initially transparent, but if the intersection ratios |
| | are computed correctly they turn opaque (become visibly green and yellow). |
| | https://www.w3.org/TR/intersection-observer/ |
| --> |
| <html> |
| <head> |
| <style> |
| div { |
| position: absolute; |
| } |
| #firstroot { |
| background-color: red; |
| width: 200px; |
| height: 100px; |
| margin: 10px; |
| margin-left: 25px; |
| } |
| #secondroot { |
| background-color: blue; |
| width: 100px; |
| height: 200px; |
| margin-left: 300px; |
| } |
| #firsttarget { |
| background-color: rgba(0, 128, 0, 0); |
| width: 50px; |
| height: 75px; |
| margin-left: -175px; |
| } |
| #secondtarget { |
| background-color: rgba(255, 255, 0, 0); |
| width: 80px; |
| height: 50px; |
| margin-left: 50px; |
| } |
| </style> |
| </head> |
| <body> |
| <div id="firstroot"> |
| <div id="secondroot"> |
| <div id="secondtarget"> |
| <div id="firsttarget"> |
| </div> |
| </div> |
| </div> |
| </div> |
| |
| <script> |
| if (window.testRunner) { |
| window.testRunner.waitUntilDone(); |
| } |
| |
| window.addEventListener("load", function() { |
| var firstRootElement = document.querySelector('#firstroot'); |
| var secondRootElement = document.querySelector('#secondroot'); |
| var firstTargetElement = document.querySelector('#firsttarget'); |
| var secondTargetElement = document.querySelector('#secondtarget'); |
| var firstIntersectionRatio = 0.5; |
| var secondIntersectionRatio = 0.625; |
| |
| function handleIntersect(entries, observer) { |
| entries.forEach(function(entry) { |
| console.log(entry.intersectionRatio); |
| if (entry.target == firstTargetElement && |
| entry.intersectionRatio == firstIntersectionRatio) { |
| entry.target.style.backgroundColor = "rgba(0, 128, 0, 255)"; |
| } |
| if (entry.target == secondTargetElement && |
| entry.intersectionRatio == secondIntersectionRatio) { |
| entry.target.style.backgroundColor = "rgba(255, 255, 0, 255)"; |
| } |
| }); |
| } |
| |
| function createObservers() { |
| var observer; |
| |
| var firstOptions = { |
| root: firstRootElement, |
| rootMargin: "0px", |
| threshold: 0.0 |
| }; |
| var secondOptions = { |
| root: secondRootElement, |
| rootMargin: "0px", |
| threshold: 0.0 |
| }; |
| |
| firstObserver = new IntersectionObserver(handleIntersect, firstOptions); |
| secondObserver = new IntersectionObserver(handleIntersect, secondOptions); |
| firstObserver.observe(firstTargetElement); |
| secondObserver.observe(secondTargetElement); |
| } |
| |
| createObservers(); |
| |
| if (window.testRunner) { |
| window.testRunner.DoNonMeasuredLayout(); |
| window.setTimeout(function() { window.testRunner.notifyDone(); }, 0); |
| } |
| }); |
| </script> |
| |
| </body> |
| </html> |
